How to Fix Psapi.dll Not Found or Missing Errors

Psapi.dll errors are caused by situations that lead to the removal or corruption of the psapi DLL file. In some cases, psapi.dll errors could indicate a registry problem, a virus or malware issue, or even a hardware failure.

This file is associated with a Microsoft helper library called process status application programming interface. See Microsoft's Process Status API page for more information.

Psapi.dll Errors

There are several ways psapi.dll errors can show up on your computer. Here are some of the more common error messages you might see:

• Psapi.dll Not Found
• This application failed to start because psapi.dll was not found. Re-installing the application may fix this problem.
• Cannot find [PATH]\psapi.dll
• The file psapi.dll is missing.
• Cannot start [APPLICATION]. A required component is missing: psapi.dll. Please install [APPLICATION] again.

Psapi.dll error messages might appear while using or installing certain programs, or when Windows starts or shuts down.

The context of the psapi.dll error is an important piece of information that will be helpful while solving the problem.

How to Fix Psapi.dll Errors

Follow these steps in the order they're given below to try the more likely fixes first.

1. Restore psapi.dll from the Recycle Bin. The easiest possible cause of a "missing" psapi.dll file is that you've mistakenly deleted it.

   If you suspect this, but you've already emptied the Recycle Bin, you may be able to recover the file with a free file recovery program.

   Start Windows in Safe Mode to complete any of these steps if you're unable to access Windows normally due to the error.

2. Run a virus/malware scan of your entire system. Some psapi.dll errors could be related to a virus or other malware infection on your computer that has damaged the DLL file. It's even possible that the psapi.dll error you're seeing is related to a hostile program that's masquerading as the file.

3. Use System Restore to undo recent system changes. If you suspect that the psapi.dll error was caused by a change made to an important file or configuration, System Restore could solve the problem.

4. Reinstall the program that uses the psapi.dll file. If the psapi.dll DLL error occurs when you use a particular program, reinstalling the program should replace the file.

   Try your best to complete this step. Reinstalling the program that provides the psapi.dll file, if possible, is a likely solution to this DLL error.

5. Update the drivers for hardware devices that might be related to psapi.dll. If, for example, you're receiving a "The file psapi.dll is missing" error when you play a 3D video game, try updating the drivers for your video card.
   

   The psapi.dll file may or may not be related to video cards—this was just an example. The key here is to pay very close attention to the context of the error and troubleshoot accordingly.

6. Roll back a driver to a previously installed version if psapi.dll errors began after updating a particular hardware device's driver.

7. Run the sfc /scannow System File Checker command to replace a missing or corrupt copy of the psapi.dll file. Since this DLL file is provided by Microsoft, System File Checker should restore it.

8. Install any available Windows updates. Many service packs and other patches replace or update some of the hundreds of Microsoft distributed DLL files on your computer. The psapi.dll file could be included in one of those updates.

9. Test your memory and then test your hard drive. I've left the majority of hardware troubleshooting to the last step, but your computer's memory and hard drive are easy to test and are the most likely components that might cause psapi.dll errors as they fail.

   If the hardware fails any of your tests, replace the memory or replace the hard drive as soon as possible.

10. Repair your installation of Windows. If the individual psapi.dll file troubleshooting advice above is unsuccessful, performing a startup repair or repair installation should restore all Windows DLL files to their working versions.

11. Use a free registry cleaner to repair psapi.dll related issues in the registry. A free registry cleaner program may be able to help by removing invalid psapi.dll registry entries that might be causing the DLL error.

12. Perform a clean installation of Windows. This will erase everything from the hard drive and install a fresh copy of Windows. If none of the steps above correct the psapi.dll error, this should be your next course of action.

    All the information on your hard drive will be erased during this step. Make sure you've made the best attempt possible to fix the psapi.dll error using a troubleshooting step prior to performing a clean installation.

13. Troubleshoot for a hardware problem if any psapi.dll errors persist. After a clean install of Windows, your DLL problem can only be hardware related.

Need More Help?

If you're not interested in fixing this problem yourself, see How Do I Get My Computer Fixed? for a full list of your support options, plus help with everything along the way like figuring out repair costs, getting your files off, choosing a repair service, and a lot more.