Originally posted by ivzm
if you still have your old pc you can find the Cd Key in the computers registry, i just cant for the life of me remember how
try googleing this method
sorry i cant be of more help

Start > run >regedit
then hunt through one of the HKEY (I think). Good places to look are the company name of who made the game eg EA games, etc.
For my computer I have one like HKEY_LOCAL_MACHINE > SOFTWARE > THQ > name of game
Then look for the one which looks like a CD key. Of course if it encrypts it which I half expect newer DRM probably does, then thats not overly
helpful.