I recently traded for a laptop on the forum. It already has windows 7 Home Premium installed, actually reinstalled, by original owner. i activated it by phone with no problems. Now when I try to intall SP1 it downloads good. Then when I rreboot it installs it, then upon starting back up on the starting windows screen when the little MS flag does its swirly it BSOD. It is to fast for me to see what it says. Upon restarting after that it goes to recovery mode and I must restore to previous version. i have had to do this a few times after attempting to install SP1. Can anyone help me with this issue?