Hello, I've been running an old copy of Windows XP on my MacBook Pro, foolishly, because it is 32-bit, and does not recognize all of my RAM. I'm wondering if I back up my entire set-up, will my programs have to be re-installed on a new 64-bit system? I assume there will be registry problems with programs, I'm not so much worried about compatibility with 64-bit just yet, I'm just concerned with the loss of everything. (Of course I could backup specific files--just the installed programs which will be a nuisance). Any experience/knowledge with this issue? Thanks.