Yeah, this be a somewhat common problem, bunny.
Here's how Microsoft says to fix it (from the link Fishin' posted)..
Microsoft Knowledge Base wrote:
To resolve the issue .. use one of the following methods:
Disable APM in the BIOS and configure Windows to manage APM. For information about how to disable APM in the BIOS, please contact the manufacturer of your computer.
To configure Windows to manage APM:
Disable Third-Party Programs and Utilities
- Click Start, point to Settings, and then click Control Panel.
- Double-click Power Management, select the settings you want for APM, and then click OK.
Disable the following types of programs and utilities:
- Screen savers
- System utilities
You could try leaving your anti-virus program running & disabling the other things on those lists (APM, screen saver, etc.) & see if that works. Otherwise, you may need to turn off your antivirus program too, reinstall windows (which wouldn't guarantee a permanent fix), or upgrade.
Though this won't apply to your particular problem, bunny, note that the majority of time-related problems with PCs are caused by a dead or dying clock battery. Techies will call it a CMOS battery or RTC battery or some such dumb acronym, but it's simply one of those flat round 3-volt watch batteries you can buy at any electronics shop or convenience store. To change one you'd need to open the PC's case and pull the old battery off your motherboard (the big circuit board in there that everything plugs in to). Unfortunetly, if the clock battery completely dies on you (and it will after 2~4 years typically), many PC's will give bizarre boot-up errors & not be able to get into Windows. (If that does happen, it's nothing that can't be fixed by simply replacing the battery -- and possibly having to reset your CMOS settings).
I work with a computer repair company, and I swear that for at least a third of the computers people bring in which won't boot, we simply go across the street to 7-11 and buy a watch battery for $2, then charge the poor customer $70 for an hour of repair. They're always thrilled they didn't lose anything.