In some cases, mfc100u.dll errors could indicate a registry problem, a virus or malware issue, or even a hardware failure, but those possibilities are unlikely.
Mfc100u.dll Errors
There are several ways mfc100u.dll errors can show up on your computer. Here are some examples of the more common ones:
Mfc100u.dll Not FoundThis application failed to start because mfc100u.dll was not found. Re-installing the application may fix this problem.Cannot find [PATH]\mfc100u.dllThe file mfc100u.dll is missing.Cannot start [APPLICATION]. A required component is missing: mfc100u.dll. Please install [APPLICATION] again.
These error messages might appear while using or installing certain programs, when Windows starts or shuts down, or maybe even during a Windows installation.
How to Fix Mfc100u.dll Errors
Need More Help?
If you’re not interested in fixing this problem yourself, see How Do I Get My Computer Fixed? for a full list of your support options, plus help with everything along the way like figuring out repair costs, getting your files off, choosing a repair service, and a lot more. You’re given a few download options from Microsoft for this update, based on the version of Windows you have installed—x86 (32-bit) or x64 (64-bit). For example, Sony’s VAIO Update software might run update procedures in the background and inadvertently cause “VUDesktopToast.exe - System Error” related mfc100u.dll errors. Removing the update tool might resolve the issue. If the hardware fails any of your tests, replace the memory or replace the hard drive as soon as you can.
