|as for his WoW files, is he worried he'll loose his character if he loses his computer? You can tell him to rest easy - those files reside on Blizzard's servers. If you installed WoW on your computer and he logged in with his Battle.NET account information, he would see his characters, along with all their weapons and armor.|
the only things that get saved locally are interface related - if he shifted the minimap to the left corner instead of the right corner, etc., that would be reset. And if he has any ADDONs installed (like ReCount or QuestHelper), he will need to download and reinstall those as well.