I bought the Fallout Collection on steam that includes FO1 FO2 and FOTactics. When i try to play FO1 and FO2 my screen turns into a swirl of rainbow colors and weird shapes. Tactics plays fine though.

Happens a lot on the newer hardware. (I've no idea why they didn't correct this for a retail release :facepalm:)

The fix is rather involved (but not too much).

Start here...
http://www.nma-fallout.com/forum/viewtopic.php?t=55845

and/ or here...
http://www.nma-fallout.com/forum/viewtopic.php?t=53311

I got the weird colors to go away with the mode=4 fix that was posted in one of those threads. The weird shapes and distortions are still there but they only show up during cut scenes so w/e.