When you start or shut down windows or you install some programs, Mfc80.dll errors messages maybe appear. Mfc80u.dll errors are the results from removal or corruption of the mfc80u dll file.

Common d3d9d.dll error messages

- "Mfc80u.dll Not Found"
- "This application failed to start because mfc80u.dll was not found. Re-installing the application may fix this problem."
- "Cannot find [PATH]\mfc80u.dll"
- "The file mfc80u.dll is missing."
- "Cannot start [APPLICATION]. A required component is missing: mfc80u.dll. Please install [APPLICATION] again."

How to install mfc80u.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 mfc80u.dll and press Enter
4. In the end, you should receive a message saying that your file was successfully installed or uninstalled.