I have Windows XP Home on a Dell PC. I've had it for about 6 months now and it was shutting down fairly quickly. I've noticed in the past month or so that when I shutdown, it may take in excess of 4 or 5 minutes before it initiates shutdown. I have Norton Internet Security enabled on it and I've done virus, spyware and adware scans. I also have the spyware software that came with the Yahoo toolbar. Do I have spyware or adware that the software isn't picking up? I've also noted that my search history is also seen in my "run" dropdown list. Any ideas?