1- Restore psapi.dll from the Recycle Bin.
2- Run a virus/malware scan of your entire system.
3- Use System Restore to undo recent system changes
4- Reinstall the program that uses the psapi.dll file.
5- Update the drivers for hardware devices that might be related to psapi.dll.
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
8- Install any available Windows updates
9- Test your memory and then test your hard drive.
10- Repair your installation of Windows.
11- Perform a clean installation of Windows
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Please read the originial post here: https://techiespost.com/fix-psapi-dll-error-code/