I have been running win xp on my iMac, and I wanted to increase the size of my bootcamp partition and also reformat my Macintosh HD. I first erased my bootcamp partition, then erased and reinstalled Snow Leopard, then went into bootcamp assistant and re-partitioned my hard drive. All that went fine, but when I try to re-install windows, I insert the windows installation disc, click "Install", my Mac logs off, reboots, and I just get a white screen. I've tried several time. Any ideas? Thanks