I have a friend who got a newer pc and moved the files from his old computer on to it. He told me he just plugged in the harddrive from the newer one into an open slot on the motherboard of the old computer and moved over the files. Everything was going fine until he tried to play some games, every time he tries to run one he gets "game.exe has stopped working" and this is all games apparently, from the ones that came with the pc to one he got on a new install of steam. However it only seems to effect games as the pictures and music from the old one open fine.
If it helps the old pc was xp and this one is vista.
Any input would be appreciated.