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perfdisk.dll errors usually have one of two causes: Windows cannot read a protected system file, or the PerfDisk performance-counter registration is damaged or disabled. First record the complete Event Viewer message, Windows edition and build, DLL path, service name, and error code. Then run the supported repair sequence in an elevated Command Prompt: DISM.exe /Online /Cleanup-image /Restorehealth, followed by sfc /scannow. If the file is present and intact but disk counters still fail, inspect the PerfDisk registry settings and rebuild the counters with lodctr and WINMGMT /RESYNCPERF. Do not download a replacement DLL from an untrusted site or run regsvr32 as a generic fix.
What perfdisk.dll does
perfdisk.dll belongs to Windows’ PerfDisk extensible performance-counter service. Performance counters provide a standard way for Windows and applications to collect operating-system data, including disk activity and usage. Performance Monitor, Task Manager, Resource Monitor, and typeperf.exe can consume those counters.
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The DLL is normally loaded through the Perflib performance-counter system rather than being launched directly. A failure may therefore appear as a Perflib event, a Performance Monitor warning, a Windows Management Instrumentation (WMI) error, or a Data Collector Set failure. The visible message can say that an Open procedure could not load, that a library could not be opened, or that disk counters are unavailable.
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A copy of the file can exist on disk while the counters remain unusable. The provider may be disabled, its registry registration may point to the wrong path or architecture, or the counter metadata may be corrupted. Conversely, a damaged or missing protected file must be repaired at the Windows component and system-file layer before counter registration work will help.
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Choose the repair branch from the symptom
| What you observe | Most likely repair layer | First action |
|---|---|---|
Event text says perfdisk.dll is missing, corrupt, or cannot be opened; the file is absent from the referenced Windows folder. |
Windows component store and protected files | Run DISM, then SFC, from an administrator Command Prompt. |
| The file exists, SFC reports no corruption, but disk counters or a Data Collector Set still fail. | Perflib registration or a disabled provider | Back up the relevant registry key, inspect the PerfDisk Performance subkey, then rebuild counters if necessary. |
| The event references a 32-bit path on a 64-bit installation, or the provider loads only for one architecture. | Architecture-specific registration | Confirm the path and Windows build before changing files or counter entries. |
| The machine runs Windows Vista or Windows Server 2008. | Legacy compatibility | Check the historical hotfix note; do not apply it to an unrelated modern build. |
These branches can overlap. A damaged component store can produce both a file error and broken counter data, so complete the DISM/SFC stage before making registry changes unless the event clearly identifies only a disabled provider.
How to tell a file failure from a counter failure
A missing-file or load error usually identifies a path and an inability to open the library. It can affect every workload that requests the provider and may appear immediately when Windows starts a monitoring session. A registration failure is different: the DLL may be present and readable, yet the provider’s Performance settings, counter names, or architecture-specific registration prevent Perflib from collecting data.
Testing more than one consumer helps separate the two cases. If Performance Monitor, a WMI query, and typeperf all lack the same disk counters, the provider or its registration is a stronger suspect than a single application’s configuration. If only one application fails while the standard tools work, preserve that application’s exact error instead of changing system-wide registry values. The Event Viewer path, service name, and error code remain the deciding evidence.
1. Capture the exact failure before changing anything
- Open Event Viewer. Press
Win, type Event Viewer, and open it. Review the event at the time the error occurred, especially under the Windows logs or the log named in the message. Record the event ID, source, service name, full text, error code, and the DLL path. - Note the provider name. The service normally appears as
PerfDisk. A message mentioning Perflib, Performance Monitor, WMI, or a Data Collector Set can still be reporting the same underlying provider failure. - Check the referenced file path. On a typical 64-bit installation, inspect
C:WindowsSystem32perfdisk.dll. If the event names a 32-bit location, record that path instead; do not copy a file between 32-bit and 64-bit locations. - Record the Windows edition and build. Press
Win+R, enterwinver, and copy the version and build number. The correct repair source and counter files must match the installed Windows generation and architecture. - Describe the workload that fails. Note whether the error appears when opening Performance Monitor, starting a Data Collector Set, querying WMI, running
typeperf, or simply booting. Also note whether disk counters are missing or only one application reports an error.
Save this information before editing the registry. It lets you tell a missing-file problem from a registration problem and gives you a baseline for retesting. If the message names a 32-bit provider on a 64-bit computer, do not assume that the copy in the standard 64-bit system directory is the one that failed.
2. Repair the component store and protected files
Microsoft’s supported first-line sequence is DISM followed by SFC. DISM repairs the Windows component store and supplies files that SFC may need; SFC scans protected system files and replaces damaged copies with a cached version.
- Open Command Prompt as administrator. Press
Win, type Command Prompt, right-click it, and choose Run as administrator. Approve the User Account Control prompt. - Run:
DISM.exe /Online /Cleanup-image /RestorehealthAllow the operation to finish. It can pause for a long time at one percentage while the component store is being checked. Do not close the window merely because progress appears unchanged.
If Windows Update cannot provide repair content, DISM can use a matching Windows installation source such as installation media, a network share, removable media, or a Windows DVD. The source must correspond to the installed edition, language, architecture, and build closely enough for Windows to use its files; an arbitrary image can leave the component store inconsistent. Note which source you used so the same source can be supplied to an administrator if repair fails.
- After DISM completes, run:
sfc /scannowLet SFC reach 100 percent. Restart Windows when it reports that repairs were made, then reproduce the original Performance Monitor or Data Collector Set action.
How to read the SFC result
- “Windows Resource Protection did not find any integrity violations.” SFC found no corruption in the protected files it checked. If the error remains, investigate PerfDisk registration and counter state.
- “Windows Resource Protection found corrupt files and successfully repaired them.” Restart, then test the workload again. A repaired
perfdisk.dllmay not clear an already damaged counter registration, so continue to the Perflib steps if the event returns. - “Windows Resource Protection found corrupt files but was unable to fix some of them.” Review
%windir%LogsCBSCBS.log. Microsoft documents filtering the log for[SR]entries to identify which protected files could not be repaired.
If the CBS log specifically identifies perfdisk.dll as unrepaired, use only a known-good copy from matching installation media or an identical Windows build and follow Microsoft’s documented ownership, permission, and offline-replacement procedure. Do not overwrite the file with a download from a DLL repository. A file copied from another computer can differ in build, servicing level, language, or architecture even when both computers show the same Windows edition.
3. Check whether PerfDisk counters are disabled
When the DLL exists and SFC reports no protected-file corruption, a disabled provider or damaged Perflib registration becomes more likely. Before editing, create a backup of the relevant registry branch: in Registry Editor, select the key, choose File > Export, and save the .reg file somewhere you can access during recovery.
- Press
Win+R, enterregedit, and approve the elevation prompt. - Browse to:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesPerfDiskPerformance- Look for the
DisablePerformanceCountersvalue. A nonzero setting can disable collection. Microsoft documents settings that distinguish all counters from 32-bit or 64-bit counters, so interpret the value in the context of the architecture named by the event. - Inspect related services’
Performancesubkeys when the event names another provider or when a broader counter rebuild is required. Do not alter unrelated services simply because they have a similarly named value.
Do not guess at a replacement value or delete the entire Performance key. Export the original key first and change only the setting identified by the documented procedure for your provider and architecture. Registry mistakes can stop applications from obtaining performance data and may require restoring the exported key. If you are unsure whether a value applies to 32-bit, 64-bit, or all counters, stop and obtain the provider-specific procedure rather than testing random values.
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If the file is present, the provider is not intentionally disabled, and counters are still missing, rebuild the affected counter registration. Microsoft’s procedure uses each provider’s counter INI file; the correct filename depends on what is installed on the computer.
- Open an elevated Command Prompt.
- Move to the system directory:
cd %Systemroot%System32- Search the INI files for the driver name:
findstr drivername *.iniUse the result to identify the INI file associated with the affected service. Do not substitute a similarly named file from another Windows build. If the search returns more than one candidate, use the service name and the original event path to identify the matching provider instead of loading every file.
- Load the identified counter definition:
lodctr <inifile>Replace <inifile> with the actual filename returned by the search. The command is intentionally not a universal one-line fix: each provider has its own counter INI file and registration requirements.
- Resynchronize WMI’s performance data:
WINMGMT /RESYNCPERFSome documented rebuild procedures also require restarting Windows or the relevant management service. Follow the restart instruction for the provider you repaired. If you exported registry keys, keep the backup until the counters have been tested across a reboot.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteRemoving arbitrary values such as Last Counter or Last Help is not a safe shortcut. Microsoft warns that deleting Performance-subkey values can temporarily affect applications until the counters are added again, and an incomplete rebuild can leave more providers unavailable than before. A rebuild should therefore target the named provider, not become a blanket deletion of every Performance subkey.
5. Restart and verify the original workload
- Restart Windows after DISM/SFC repairs or when the counter-rebuild instructions call for it.
- Open the same tool that produced the error: Performance Monitor, the Data Collector Set, a WMI query,
typeperf, or the affected application. - Check that disk-related counters populate instead of showing no data, and that the original event does not recur in Event Viewer.
- If only one counter remains absent, record its exact object and instance name. A single missing counter can indicate a provider-specific registration problem rather than a failure of
perfdisk.dllitself.
These are documented repair methods, not a guarantee for every Windows build or third-party monitoring program. If the same event returns, preserve the new event details and the SFC/CBS results before attempting another change. Comparing the new event with the original tells you whether the failure moved from file loading to counter registration or whether both layers remain affected.
When the file is still missing after SFC
A missing file that SFC cannot restore points to a damaged component store, an unavailable repair source, or a Windows installation that does not match the source being used. Run DISM again with matching installation media or another supported source, then rerun SFC. If offline recovery is required, use Microsoft’s documented offline DISM/SFC and file-replacement guidance for the installed drive and Windows directory.
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Do not copy perfdisk.dll from another computer merely because both systems appear to run the same edition. Builds, servicing levels, language files, and 32-bit versus 64-bit architecture can differ. A mismatched DLL can create a new loader or counter-registration error.
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Microsoft’s current documentation preserves a historical note about a known PerfDisk.dll issue affecting Windows Vista and Windows Server 2008. Hotfix 961382 was incorporated into Service Pack 2 for those legacy systems. This is a compatibility note for that Windows generation, not a current fix for Windows 10 or Windows 11. Do not apply the old hotfix to an unrelated build; use the repair source and servicing guidance that match the operating system shown by winver.
What not to do
- Do not use a random DLL-download site. You cannot verify that its file matches your Windows build, architecture, servicing level, or ownership metadata.
- Do not run
regsvr32 perfdisk.dllas a generic remedy. Performance-counter libraries are configured through Perflib service registration, and a registration error has different causes from an ordinary COM DLL-registration problem. - Do not edit
Last Counter,Last Help, or other Performance values without a backup and a documented rebuild plan. Incorrect edits can remove counter data for applications that otherwise work. - Do not apply the Vista/Server 2008 hotfix to a modern Windows installation. Its scope is limited to the legacy issue described above.
- Do not assume that a present file proves the provider is healthy. Disabled counters, a wrong path, architecture mismatch, or corrupted registry metadata can fail even when the DLL opens in Explorer.
When to seek deeper Windows servicing help
Escalate to an administrator or Microsoft-supported servicing workflow when DISM cannot complete with a matching source, SFC repeatedly reports unrepaired files, the CBS log identifies multiple damaged system components, or registry restoration does not recover the counters. Provide the exact event text, event ID, Windows build, architecture, file path, DISM result, SFC result, and the relevant CBS log entries. That evidence is more useful than replacing files blindly.
Frequently asked questions
Is perfdisk.dll a separate program I should launch?
No. It is part of the PerfDisk extensible performance-counter path and is loaded by Windows monitoring and management components. Launching the DLL directly does not repair its provider registration.
Why run DISM before SFC?
DISM repairs the component store and provides the files that SFC may need. SFC then scans protected files and replaces corrupted copies with a cached version. Running the commands in the reverse order can leave SFC without a usable repair source.
What if the DLL exists but Performance Monitor still shows no disk data?
Check the PerfDisk Performance registry key for DisablePerformanceCounters, confirm that the event is not referring to a different architecture, and rebuild the affected counter definition with its matching INI file, lodctr, and WINMGMT /RESYNCPERF. Back up the registry first.
Should I use regsvr32 after replacing the file?
No. Performance-counter libraries use Perflib service registration rather than ordinary COM registration. Use DISM/SFC for a protected-file problem and the documented counter-rebuild procedure for registration damage.
Can I apply hotfix 961382 to Windows 10 or Windows 11?
No. The documented issue and hotfix concern Windows Vista and Windows Server 2008, with the fix included in Service Pack 2 for those systems. Modern Windows installations require matching current servicing and counter-registration procedures.
What should I do when SFC cannot repair perfdisk.dll?
Review the [SR] entries in %windir%LogsCBSCBS.log, run DISM with matching installation media or another supported source, and rerun SFC. For offline replacement, follow Microsoft’s ownership, permission, and offline-recovery guidance rather than copying a file from an unrelated computer.
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Repeat the workload that originally failed, verify that disk counters populate in the same tool, and confirm that the original Event Viewer entry does not recur. Test after a reboot when the provider’s rebuild instructions require one, and keep the registry export until the result is stable.
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Frequently Asked Questions
What is the fastest supported way to fix a perfdisk.dll file error?
Record the event details, then run DISM.exe /Online /Cleanup-image /Restorehealth in an elevated Command Prompt, followed by sfc /scannow. Restart and test again. If the file is intact but counters still fail, repair PerfDisk registration instead.
Why does perfdisk.dll fail even though the file is present?
The provider can be disabled, registered to the wrong path or architecture, or have corrupted counter metadata. Check the PerfDisk Performance registry key and rebuild the matching counter definition when needed.
Is it safe to download perfdisk.dll from the internet?
No. Downloaded files may not match your Windows build, architecture, servicing level, permissions, or ownership. Use DISM, SFC, or matching installation media.
Does regsvr32 repair perfdisk.dll?
Not as a general fix. Performance-counter libraries are configured through Perflib service registration, so use the documented counter-rebuild process for registration problems.
What does DisablePerformanceCounters mean?
A nonzero value can disable collection for all counters or for a particular 32-bit or 64-bit category. Back up the registry and interpret the setting against the event’s architecture before changing it.
Which Windows versions used hotfix 961382?
The historical PerfDisk.dll issue covered Windows Vista and Windows Server 2008, and the hotfix was incorporated into Service Pack 2. It is not a fix for Windows 10 or Windows 11.
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The Bottom Line
Start with evidence, not a replacement DLL: capture the exact event, run DISM and then SFC, and only move to PerfDisk registry and counter rebuilding when the protected file is present and intact. Match every repair source and counter file to the installed Windows build and architecture, back up the registry before edits, and verify the original monitoring workload after a restart.
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