My hard drive on my PC laptop needs to be replaced according to HP diagnostics. Fortunately, it still works fine. HP sent a new one today. The hassle is that I have to back up things to a DVD since I don't have a better backup solution, ie. Time Machine! When I do switch, I still need to get an external hard drive for this PC. I been at it for about an hour and I still haven't even pulled out the old drive! I anxiously await the justification to buy a 13" MBP (justification is needed since I am out of work-4 1/2 months now). So, 32bit or 64bit Windows for this laptop?