CPU is changed or replugged error message

I have a Pentium II MMX computer with Award Plug and Play Bios (1997).  When I turn on the computer, I get the error message "CPU is changed or replugged, please set CPU core speed in setup".  I have set the CPU speed many times by entering BIOS (and saved the new setting), but I still get the same error message every time the computer is booted (cold or warm boot).  I can bypass the error message by pressing F1.  A related problem is that between boot-ups, the computer does not keep time - the time at boot up is always the time the computer was turned off.  Is this a battery problem?  Thanks for your help.
VenkatagiriAsked:
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jhanceCommented:
Your CMOS backup batter is either dead or disconnected or (unlikely) the CMOS RAM is failed.

If it dates from 1997, I'd replace the battery first.  The normal lifetime is only about 3 years so you're at the typical limit already.
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VenkatagiriAuthor Commented:
I have never replaced a battery in my computer.  Is there only one battery on the motherboard or should I be concerned about which battery I replace?  Where would I typically find this battery - a computer store or the nearest WalMart?  Thanks for your help.
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jhanceCommented:
There is usually only one battery in your computer and it is most likely of the small "coin" type.  This is usually mounted on the motherboard itself, often near the rear of the case and between the ISA bus slots and the keyboard connector.  It can be anywhere however.

Locate the battery and see what it's number is.  It's unlikely that WalMart will have one but RadioShack probably will.
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craig_capelCommented:
to help you along its probably (Nearly all motherboards with the award bios) is this:

Lithium CR2032 3V Battery, little disc shaped one.....


Hope that helps

Craig C.
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rayt333Commented:
Which is available at Walmart for around 3 or 4 dollars
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craig_capelCommented:
rayt? whats a Walmart?

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rayt333Commented:
Large Deptment store chain in the US
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VenkatagiriAuthor Commented:
jhance, craigcapel and rayt333, thank you for your help.  I have replaced the battery and that seem to have taken care of the problem.  I am sure that I will replace the computer before the battery next time!
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craig_capelCommented:
rayt, we call them shops or supermarkets in England :)
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