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Works fine on mine.

I've heard of problems when it's installed in the Program Files folder, though - something about Windows moving files around or somesuch. Personally, I always install to a different folder (C:\Games) anyway.
 
64bit Win 7 here and have it installed to the Program Files folder, seems to work fine.

Though, it's always better to install somewhere else than the PF folder.
 
I installed in a different folder, but there is an error (I press start in the launcher and there is some kind of debugger message what is wrong). Any idea why? Previously it worked under XP.
 
I installed in a different folder, but there is an error (I press start in the launcher and there is some kind of debugger message what is wrong). Any idea why? Previously it worked under XP.
Post the full error and system details in Tech Support, and we'll get you going.