Hey, new to macs here actually new to apple also. I had a few questions regarding installing windows 7 on my late 2009 macbook pro 15". What is the difference in bootcamp and parallels is it? Does one run like a virtual windows in the background while bootcamp let's you boot in either osx or windows? I have a xps desktop from Dell that has windows vista pre installed. Now i bought a copy of windows 7 when it was released fro newegg. Now I assume I cannot use that disc and serial, is that correct? Since i use it on my xps desktop? I would need to purchase another copy of windows correct? With that said, which version do i purchase? 32 or 64 bit? My macbook pro is pretty much already setup (apps, pics, music, etc) can i still install windows 7 or will it format my HD and i would need to then reinstall everything on the Mac side? What are the "major" cons to installing windows 7 on a mbp? So far I have gathered battery life being the biggest con, any others? I bought. My mbp around Xmas time and i must admit i love it..osx is awesome and i hardly ever touch my pc desktop anymore, so what i would like to do is put windows 7 on my mbp so possibly in the future i could RID of my desktop pc all together, that's IF windows 7 runs smoothly on my mbp. Any help or advice for a boob would be great before i go ahead with this, thanks.