Lately (for about a week), my PC takes about 5 minutes to shut down or restart...what could cause this? I did a search, but no topic was started here. I did a google search, and did the only thing suggested, turning my NVIDIA service to Manual and that worked once. I did a virus, spyware, & adaware scan, came out clean. I haven't downloaded any new programs. I have Windows XP SP2 with all updates done.