Be careful not to confuse this error withmfc100.dll errors.
How to Fix Mfc100u.dll Errors
Do not download mfc100u.dll from a “DLL download” website.
There are many reasons whydownloading a DLL file that way is a bad idea.
Download the Microsoft Visual C++ 2010 Service Pack 1 Redistributable Package MFC Security Updateand run it.
This will replace/restore the mfc100u.dll with the most recent copy provided by Microsoft.
Try your best to complete this step.
Applying this update is almost always the solution to mfc100u.dll errors.
Install any available Windows updates.
Manyservice packsand otherpatchesreplace or update some of the hundreds of Microsoft distributed DLL files on your machine.
The mfc100u.dll file could be included in one of those updates.
It’s possible that a specific update is necessary before the mfc100u DLL file can work properly.
Restore mfc100u.dll from the Recycle Bin.
The easiest possible cause of a “missing” mfc100u.dll file is that you’ve mistakenly deleted it.
Run a virus/malware scan of your entire system.
There are plenty offree AV programsavailable for Windows.
Shut down or uninstall the program that’s causing the DLL error.
Sometimes, a program will run an unwanted or unnecessary background process that gives this mfc100u DLL error.
Removing the update tool might fix the issue.
This step should be followed only if you don’t necessarily need the program.
If you’d rather keep the program, considerreinstalling the softwareinstead.
Use System Restore to undo recent system changes.
Test your setup’s memoryand thentest the hard drive.
If the hardware fails any of your tests,replace the memoryorreplace the hard driveas soon as you might.
Repair your installation of Windows.
Use afree registry cleanerto repair mfc100u.dll related issues in the registry.
I rarely recommend the use of registry cleaners.
Perform a clean installation of Windows.
This will erase everything from thehard driveand install a fresh copy of Windows.
If none of the steps above correct the error, this should be your next course of action.
All the information on your hard drive will be erased during a clean install.
Troubleshoot for a hardware problemif any mfc100u.dll errors persist.
After a clean install of Windows, your DLL problem can only be hardware related.
Need More Help?
There are several ways mfc100u.dll errors can show up on your setup.
