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If you get this error 

Mfc100u.dll file missing then follow guide below

1. Download the Microsoft Visual C++ 2010 Service Pack 1 Redistributable Package MFC Security Update and run it. This will replace/restore the mfc100u.dll with the most recent copy provided by Microsoft.

   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).

   Try your best to complete this step. Applying this update is almost always the solution to mfc100u.dll errors.

2. Install any available Windows updates. Many service packs and other patches replace or update some of the hundreds of Microsoft distributed DLL files on your computer. The mfc100u.dll file could be included in one of those updates.

   Update Windows even if you know the DLL file isn't going to be installed with one of the updates. It's possible that a specific update is necessary before the mfc100u DLL file can work properly. In other words, this DLL file might be dependent on another file or set of files that could be included in a Windows update.

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