How to Fix msvcr120 dll Errors

FIX: How to Fix Mfc80u.dll Error or Missing Error - 2021

There are several different ways that mfc80u.dll errors can show up on your computer. Below are some of the most common ways that mfc80u.dll errors can appear:

  • "Mfc80u.dll not found"
  • "This application failed to start because mfc80u.dll could not be found. Reinstalling the application may resolve this problem."
  • "Cannot find PATH mfc80u.dll"
  • "The file mfc80u.dll does not exist."
  • "Cannot start APPLICATION. A required component is missing: mfc80u.dll. Please install APPLICATION again."

Mfc80u.dll error messages can appear while using or installing certain programs during Windows startup or shutdown, or even during a Windows installation.

The context of the mfc80u.dll error is important information that will be helpful in solving the problem.

Cause of Mfc80u.dll errors

Mfc80u.dll errors are caused by situations that result in the removal or corruption of the mfc80u dll file.

In some cases, mfc80u.dll errors could indicate a registry problem, a virus or malware problem, or even a hardware failure.

How to fix Mfc80u.dll errors

Important: Do not download mfc80u.dll from a "DLL Download" website. There are many reasons why downloading a DLL file is a bad idea. If you need a copy of mfc80u.dll, it is advisable to obtain it from its legitimate source.

Note: To do one of the following, if you normally cannot access Windows due to the mfc80u.dll error, start Windows in Safe Mode.

  1. Download and run the MFC Security Update for Microsoft Visual C ++ 2005 Service Pack 1. This will replace / restore the mfc80u.dll with the latest Microsoft provided copy.
    1. For this update, you will receive several download options from Microsoft based on the version of Windows you have installed - x86 (32-bit) or x64 (64-bit). See Am I a 32-bit or 64-bit version of Windows? Help if you are not sure what to choose.
    2. Important: Try your best to complete this step. Applying this update is almost always the solution to mfc80u.dll errors.
  2. Restore the mfc80u.dll file from the Recycle Bin. The simplest possible cause of a "missing" mfc80u.dll file is that you accidentally deleted it.
    1. If you suspect that you accidentally deleted the mfc80u.dll file but emptied the Recycle Bin, you might be able to restore the mfc80u.dll file using a free file recovery program.
    2. Important: Recovering a deleted copy of mfc80u.dll with a file recovery program is only a smart idea if you are sure that you deleted the file yourself and that it was previously working properly.
  3. Run a virus / malware scan of your entire system. Some mfc80u.dll errors could be related to a virus or other malware infection on your computer that has corrupted the dll file. It is even possible that the mfc80u.dll error you are seeing is related to a hostile program masquerading as a file.
  4. Use System Restore to undo the most recent system changes. If you suspect that the mfc80u.dll error was caused by a change made to an important file or configuration, a system restore could fix the problem.
  5. Reinstall the program that generated the mfc80u.dll error. If the mfc80u.dll error occurs while using a particular program, reinstalling that program can help.
  6. Install any available Windows updates. Many service packs and other patches replace or update several hundreds of Microsoft DLL files on your computer. The mfc80u.dll file could be included in one of these updates.
  7. Test your memory and then your hard drive. I've left most of the hardware troubleshooting up to the last step, but your computer's memory and hard drive are easy to test and are the most likely components that can cause mfc80u.dll errors if they fail.
    1. If the hardware fails any of your tests, replace the memory or replace the hard drive ASAP.
  8. Repair your installation of Windows. If the troubleshooting tips above were unsuccessful for the individual mfc80u.dll file, performing a startup repair or repair installation should restore all Windows DLL files to their working versions.
  9. Use a free registry cleaner to repair mfc80u.dll-related problems in the registry. A free registry cleaner program can help by removing invalid mfc80u.dll registry entries that could be causing the DLL error.
    1. Important: I rarely recommend using registry cleaners. I've included the option here as a "last resort" before the destructive step comes next.
  10. Perform a clean installation of Windows. Reinstalling Windows will erase everything from the hard drive and install a fresh copy of Windows. If none of the above steps corrects the mfc80u.dll error, this should be your next course of action.
    1. Important: All information on your hard drive will be deleted when you reinstall. Make sure that you have made the best possible attempt to resolve the mfc80u.dll error by performing a troubleshooting step beforehand.
  11. Fix a hardware problem if mfc80u.dll errors persist. After reinstalling Windows, your DLL problem may only be hardware related.

What this error applies to

The mfc80u.dll error message could apply to any program or system using the file on any of Microsoft's operating systems, including Windows 8, Windows 7, Windows Vista, Windows XP, and Windows 2000.