onboard clock

Usually this means you need to replace your PC's battery. Open up the case, look for the battery, unplug it, take it to the computer store and get an equivalent replacement, usually for about $20.

Or you can take the computer to a repair shop and they'll put in a battery for $50-100.

This is not an optional replacement. Your computer won't run without a battery.

Many times though, if it's a bad battery, you'll lose all your cmos settings. When just the clock goes bad, you may have a bad RTC on the mobo and will need a mobo replacement.

If your computer is over 3 years old though it's probably the battery

The battery is a common culprit, but software can mess with the clock also. Older versions of antivirus applications are known to sometimes set back the clock. See the Symantec and/or McAfee websites. I have also seen an old DOS remote backup-via-modem program that messed up the clock - though I never did understand how it could do so.

It is also possible that suspend or hibernate is causing a problem. Do you do a full shutdown?

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