QUOTE
I recently upgraded to Windows 7, and now any GM game I try to play gives me the error "Failed to load game data. File seems corrupted."
Another member had a
similar problem, it was resolved when he created another account which could run all the games.
His conclusion was the account was corrupt. What is more likely is that account ran an incompatible program at login in.
Create a new account, test GM exes. If they work, go back to the original account and start disabling programs that run automatically until it can be determined what the problematic program is.