Can anybody help me. I've just purchased fallout 1,2 and tactics, i started the game up on my pc but all the colours have gone crazy. Ive adjusted the resolution to the lowest setting, but nothing changes, just like war.

You got them on steam? If so, this is for Fallout 2:
If you don't know how to access the files: Computer > (OS:C) Program Files (x#) > Steam > SteamApps > Common > Fallout 2