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CMOS Checksum bad

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Hello all experts,
When i on my computer one day i get this error
"CMOS checksum bad"
Press F1 to edit .....
Press F2 to load the default value ....
I always log in my bios to update the primary drive,secondary ,time,date,and so on.
If i press F2 it will open my computer in 633mhz . My computer is running on os win98se chinese simplified, celeron 800mhz 196 ram.
Why is this happen ?
Everytime i open my computer this happen.
Thank you please help.
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Hey enter your BIOS and if it has an option called 'Reset Configuration Data' make it is on yes and save and exit the CMOS. If that doesn't work eneter the CMOS and make sure all values (date and time ect.) are correct. This happens when you have shut down your computer by pulling the power cord out or when you tryed to update your bios, also your CMOS battery could be dead or dieing.
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