Recently my laptop will not boot properly. Upon booting I see the welcome screen from windows 7 then all I have is a blank screen with a cursor. I was able to boot into safe mode and run virus scans but nothing was found. Previous to having this boot issue my laptop was running slowly. It would boot up, run VERY slowly for a few minutes, then completely freeze. The mouse wouldn't move and ctrl-alt-del wouldn't either. Please help. Thanks.