My Games are BROKEN D: Help?

[Oscar House]

I'm no expert on the matter, but here goes.
Because you reinstalled Windows, you probably lost all the drivers, not just graphics drivers. If you haven't yet, install motherboard chipset drivers to see if the problem lies there.
Another thing to try is to first get rid of the graphics driver you already installed, then installing an older version (perhaps one that came on a CD with the graphics card).