Since you use windows xp, you can recover your whole computer system by the followed steps:
1. Start>All Programs>Accessories>System Tools>System Restore.
2. Choose "Restore my computer to an earlier time." , then click "Next".
3. Choose a day when you are sure that you...
As this happens every time when the PC boots or restarts, it means that the battery doesn't supply power to CMOS. You would better to use voltage tester to check the voltage (3.6V) on COMS chip (not on the battery) after you shut down your computer.
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