If the time problem only occurs because you turn off the PC, the most likely candidate would be what is known as the CMOS battery. It's like wrist watch size battery that is designed to keep certain settings, like date and time, going on the PC even though it's off. If that battery is getting weak, then it does a horrible job of keeping time. When it completely fails, your PC resets to Jan 1st, 2001 every time it's turned off.
It is possible a time program got accidentally installed on the PC or a virus is doing it, but to be honest I never really saw that on any person's PC I had to repair. It's just simply a possibility.
For XP, a possible workaround is to use the internet time function where windows itself tries to set the time correctly. It could also be possible that it's internet time messing you up.
But you would double click on the date/time area on the taskbar, bring up "Date and Time Properties", and go to the "Internet Time" tab. Make certain it is checkmarked there to connect to a time server.
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It's like wrist watch size battery that is designed to keep certain settings, like date and time, going on the PC even though it's off.
If that battery is getting weak, then it does a horrible job of keeping time.
When it completely fails, your PC resets to Jan 1st, 2001 every time it's turned off.
It is possible a time program got accidentally installed on the PC or a virus is doing it, but to be honest I never really saw that on any person's PC I had to repair. It's just simply a possibility.
For XP, a possible workaround is to use the internet time function where windows itself tries to set the time correctly.
It could also be possible that it's internet time messing you up.
But you would double click on the date/time area on the taskbar, bring up "Date and Time Properties", and go to the "Internet Time" tab. Make certain it is checkmarked there to connect to a time server.