Bassem wroteThe-MMMs that sounds like a good method, but it might not work if the copy is altered in some way, as cracked games often are.
I'd really like to get some not-so-new original PC games for online gaming, such as Armed Assault and Unreal Tournament 2004.
it DOES work
ive done it for: Mw2, Geometry Wars, and Borderlands
what i advise is dnt copy over the .exe file(s)
as long as it isn't those heavily modded games, but the only diff between a cracked and original game is the exe file, everything else stays intact.
you see all games sync with the steam cloud so steam will fill in what is wrong/or missing ;) as long as you buy the game through steam and download some of it (so the game folder will appear in the steamapps folder) then your good to go to copy paste over the files.