I installed the Service pack 1 in the windows 7 OS and it works!!!!
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I also had same problem, new computer with Nvidia GTX 760, the C2 layout editor was all glitched and couldn't see anything, and the event sheet editor had bits overlapping and scroll up/down didn't refresh the view.
I started to panic, forked out lots of money for brand new high end PC and I couldn't use C2 at all. It even crashed once every 10-mins too.
So I took your advice, and updated Win 7 (64-bit) to Service Pack 1 and it fixed everything.
You can download Service Pack 1 from Microsoft's website, it's about 900-megs. But try doing via Windows Update first. Yay I'm happy now Thanks Katzin!!!