Dell Dimension 3000 had viruses. I killed them off with PCtools Spyware Doctor with Antivirus. Then to fix things up I ran a repair install with the Dell XP Home SP3 CD. The system gave me the option to run repair install, copied the files, and rebooted. When the setup came back up I get a windows logo then a blank screen and mouse. Then it just sits there. I can't shift F10 or anything. I need some tips on how to troubleshoot what it is hanging on and get it past and repair windows.