I just re-install Windows 7 and put back some of my steam games back on it. I made sure that all my drivers and direct x where installed, but when I loaded up any 3d game I had tons of lag which was usual for my PC. Most of the time I could run very high graphics game without any lag or any problems.
I did some searching throughout out tons of site to see if anyone else had this problem. I found a ton of people saying the same thing re-install Windows 7 tons of lag now, but when that found a solution that would not say what it was. I did tons of the things that the sites said like check temp or hardware failure but they were all fine.
Weird... figured it out after consulting my computer nerd dad, it was the graphics card drivers. i installed the ones from the company and they where slow and laggy, but after i uninstalled the drivers and let windows 7 pick the drivers it was fine.