Only way to shut down is unplug the computer.
I was up at my daughters for a few days and since the new baby has had very little time for computing. When I was there in April, I installed the 2005 Nortons anti-virus, ad-aware, cleaned up her machine ( ran defrag, disk cleanup, etc.) all of which she very seldom did, but I had it running smoothly, no viruses, etc. Also did an online virus check at pc pitstop to confirm no viruses that Nortons said.
So this time, when I started her computer, it seemed fine , but it froze when I was on the internet and nothing I tried would shut it off, unless I unplugged it. I was able to do a live update for Nortons, and adaware....defrag, etc. uninstalled her printer(which doesn't work anyway) uninstalled print shop and another large prog, because she can't print anything out right now. But all this was done, inbetween unplugging and plugging because at some point it would freeze up again.
She had a Compaq, with about 9.something gig of disk space, only 4. something used, windows xp home. It is several years old. I told her that I thought her hard drive was going. Anyone have any other thoughts??