I'll give you the entire rundown.
Since I hadn't updated my drivers in a really long time one day I decided to while some stuff was installing. I also hoped a side-effect of this would be a minor performance boost. So I went ahead and downloaded the drivers (either old or wrong ones). What ended up happening was that higher demand games like GTA and Crysis were lagging so I came here for help. I followed the steps you provided which had a neutral effect. The drivers woudln't apply seemingly, since the resolution remained lower and the theme was stuck at windows 7 basic. I system restored and it was all good. I was okay with it until all of my games begun to lag. The odd thing is, it comes in spikes. The games will lag for a minute and return to normal for a minute and the cycle repeats. I scanned for malware even though it wasn't very likely. Everything else works perfectly though.
Here's dxdiag before the really bad things begun.
I'll try to give you any information you need to help if you want.
