Pfilter.dll is a process belonging to the Microsoft Exchange program. Pfilter.dll error messages may display on screen once Windows starts up or shuts down or when users try to open a program without its required dll file. The causes of such pfilter.dll errors are usually missing or deleting the file of Pfilter dll file. There are many dll file in Microsoft Exchange program, such as ese.dll.

Commmon pfilter.dll error messages:
- "Windows could not start because the following file is missing or corrupt: Windows root\system32\Pfilter.dll. Please re-install a copy of the above file."
- "Winnt_root>\System32\Pfilter.dll missing or corrupt: Please re-install a copy of the above file."
- "Cannot find \Windows\System32\Pfilter.dll."
- "Cannot find Pfilter.dll."
- "A required .DLL file, Pfilter.dll was not found."
- "Program requires the file 'Pfilter.dll' to run. Run Setup again to assure proper installation."

How to install PFILTER.DLL file?

1. Press Start and select Run
2. Type CMD and press Enter (or if you use Windows ME, type COMMAND)
3. Type regsvr32 PFILTER.DLL and press Enter
4. In the end, you should receive a message saying that your file was successfully installed or uninstalled.