Star Wars: Knights of the Old Republic

I upgraded to Windows 7 recently, and since then both of my old BioWare games (KOTOR and NWN) have run, but with jagged black bars chopping up the screen. The games run, but the display issues are headache-inducing, a little choppy, and generally painful to look at. Both games ran fine on Vista SP1. I'm using a laptop, so I don't think it's a hardware driver problem, but it could lie with the new DX11. I've tried compatibility mode for both Win2000 and XP, neither helps. What's up?

Additional details - 11/4 5:56AM

Also, I'm using the Steam version. That usually means something. Usually bad.

Additional details - 11/4 6:12AM

Further, the bars don't appear in opening cinematics/title sequences. One once I'm in the main menu do they appear. Ugh. So many false hopes...