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I am not sure this will help you but sometimes the problem, when not the battery, can be found in the BIOS/CMOS settings. You can get to the BIOS clock by entering the BIOS or CMOS settings during boot up of your computer. The key used to enter the BIOS/CMOS settings is different for each machine. Normally, when you reboot or turn on your computer, you will see something that mentions hitting a specific key to get into settings or configuration or something like that. Generally, the key is something like F8, F4, Space Bar, Enter, etc. If you see the Windows XP loading screen, then it is too late and you will have to reboot and try again.
Once you get into the BIOS/CMOS settings, make sure that the time and date are set correctly. Make sure to save the changes and then exit from the BIOS/CMOS. I hope this helps.