I paid $49 for the preorder upgrade of Win7 home premium when they had the special back in june, which includes 64 bit version. for me it made a huge amount of sense comparing to how much it would have cost me to upgrade from XP 32 bit to either XP64 or Vista64bit. and that XP compatibility thing is really only important if you have really ancient software, I havnt found that one piece of software I own and still use has had any problems running on Win7