I was being sarcastic, hence the smiley face!

That's what they all say.

There are two ways to fix this problem. Mfc100u.dll is a part of Microsoft Visual Studio 10 so you should reinstall this windows component. Sometimes reinstalling didn't help, in this case try to download this file from internet, for example . Place this file to your windows/system32 folder. 

uper1968
There are two ways to fix this problem. Mfc100u.dll is a part of Microsoft Visual Studio 10 so you should reinstall this windows component. Sometimes reinstalling didn't help, in this case try to download this file from internet, for example . Place this file to your windows/system32 folder. 

You may not have noticed, but this thread is almost 4 years old (the post above yours is dated July 2012).