Upddrv9x.dll is a process belonging to the upddrv9x.dll Module program. Upddrv9x.dll error messages display on screen once your PC has booted up or, when you attempt to run a program or application and it can't find its required dll file. These upddrv9x.dll errors are the result of missing or corrupting the upddrv9x.dll file or having registry error.

Common upddrv9x.dll error messages:
- "Windows could not start because the following file is missing or corrupt: Windows root\system32\Upddrv9x.dll. Please re-install a copy of the above file."
- "Winnt_root>\System32\Upddrv9x.dll missing or corrupt: Please re-install a copy of the above file."
- "Cannot find \Windows\System32\Upddrv9x.dll."
- "Cannot find Upddrv9x.dll."
- "A required .DLL file, Upddrv9x.dll was not found."
- "Program requires the file 'Upddrv9x.dll' to run. Run Setup again to assure proper installation."

How to install UPDDRV9X.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 UPDDRV9X.DLL and press Enter
4. In the end, you should receive a message saying that your file was successfully installed or uninstalled.