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MFC80u.dll Error – Missing Or Not Found mfc80u.dll Error Fix

mfc80u.dll is a “Microsoft Foundation Class” (MFC) file which is used by Microsoft Visual Studio 2005. It is used to help run programs that have been produced in Visual Studio 2005 and has been designed to deal with various mathematical based functions that many programs require.

What Causes Mfc80u.dll Errors?

Such errors that are typically caused by mfc80u.dll include:

  • Mfc80u.dll not found
  • Mfc80u.dll is missing
  • The program failed to load because mfc80u.dll was missing. Reinstalling the application may resolve this error.

These errors typically appear when you try and run various programs on the Windows system, or when Windows loads up. The causes of this error are pretty typical, in that most of the time, it’s down to the file becoming corrupted or damaged through over-use. Other problems include the file becoming infected with malware or having registry damage.

How To Fix Mfc80u.dll Errors

Step 1 – Reinstall A Program Causing The Error

If you are receiving this error from running a specific program, the first thing you should try is to uninstall the program and then reinstall a fresh copy. To do this, you should first click on Start > Control Panel > Add / Remove Programs and then find the program that’s causing the problem. You should then highlight the program and click “Uninstall” next to it. This will remove the software from your PC. After that, use the installation CD or a download to install a fresh copy of the program back onto the system. This will install fresh versions of the files onto your PC and will allow your computer to read the mfc80u.dll again

Step 2 – Manually Replace mfc80u.dll On Your PC

It’s often the case that the mfc80u.dll file will become damaged on your system for a variety of reasons. The next best thing you can do is to replace this file with another file that’s downloaded from one of the reliable Internet depositories.  Here’s how you can do that:

1) Download from our server

2) Unzip the mfc80u.dll file onto your computer’s hard drive

3) Browse to c:\Windows\System32

4) Locate the current mfc80u.dll on your system

5) Rename the current mfc80u.dll to mfc80uBACKUP.dll

6) Copy & paste the new mfc80u.dll into C:\Windows\System32

7) Click Start > Run (Or search”run” on Vista & Win7)

8 ) Type “cmd” in the box that appears

9) Type “regsvr32 mfc80u.dll” on the black screen

10) Press enter

11) Try your programs again

This will replace the current mfc80u.dll file on your PC and will put a new file in its place. This will make your system much better able to read the file, as in many cases, it’s a corrupt or damaged version of mfc80u.dll which will make it unable to be read properly.  This method should work for many people but if it did not for you, then you can use method #3 below:

Step 3 – Clean Out Viruses

– Download This Virus Scanner

Antivirus programs are software tools which scan through your PC and remove any of the viruses or malware infections that are on your system. It’s often the case that viruses will infect various DLL files on your computer and then cause them to be unreadable to your PC. To ensure this is not happening on your computer, you should try using an antivirus program to scan through your system and remove any of the infections that cause all these errors. You can download our recommended antivirus program from the link above, but there are a large variety of programs available.

Step 4 – Clean The Registry

– Download This Registry Cleaner

The ‘registry’ is a big database inside Windows which keeps a large list of references for the DLL files on your system. This central database is where Windows keeps a list of the DLL file locations for your computer, and is where your system looks each time it wants to use a dll file such as mfc80u.dll. Unfortunately, it’s prone to becoming damaged and corrupted and is constantly being unable to read the files and references that it needs to open the files that it wants. This is a major problem that causes a lot of damage to many different parts of your system. Running a registry scan will remove all the damaged references inside the registry, allowing it to run as quickly and smoothly as possible.

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