# 2... If it is a game that utilizes STEAM to run, there is no issues ... Example COD MW2 & COD BO. Once you reinstall STEAM, you just load the games again and all your user data is there. If it is a non-STEAM game, you will need to back up your player profile... Example COD MW & Cyrsis. I have my STEAM authorized on two PC's (parent's house & my PC) and it stays current with the most recent info.
# 1), 3), & 4)... I agree with