My parents computer has windows millenium installed on it. A couple of weeks ago it started locking up for no apparent reason. It will boot up fine, and then lock up solid after 5-10 minutes. It happens whether your in a program or just looking at the desktop screen. I've done 2 system restores going back a whole month and that didn't work. You can't run any of the other utilities because it locks up in the middle. There are no error messages either.

Does anyone know what I can do short of reinstalling it? I'd really like to backup their files before I do that.

The computer is a Compaq Presario 5000 series.

Any help would be greatly appreciated.
Thanks