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Do you have that problem when you open a regular command prompt...
...or only when you open an administrative one?
Does the shortcut on the Start Menu look like this:
Edit: Do you have that problem when you open the Start Menu as shown in the video in my second post to this thread.
Try the steps in option two mentioned here:
SFC /SCANNOW Command - System File Checker
If it finds/fixes stuff - be sure to run it a few more times.
Edit2: Once you've answered those questions, we can work thru the registry values.