CMOS/GPNV Checksum Bad

Tech-Archive recommends: Speed Up your PC by fixing your registry

When I turn on the computer, I get the black screen with old-time DOS
letters that say, among other things:

CMOS/GPNV Checksum Bad

This was intermittent for a while, now it's becoming constant.

When I "Press F2 to load default values and continue", I have to
reset the clock all over again. It usually comes on set on Feb. 5, 2002
which is approximately the time I first had XP installed (I don't
remember exactly). But sometimes it is other years, like 2096.

And I think related to this might be that my Norton Anti-Virus keeps
giving me the window saying my subscription is expired, even tho I
renewed it last May, and I occasionally see the little window in the
lower right corner saying "Your (blah blah)s have been updated"

I have messed with CMOS chips from Radio Shack like the 4049 hex
inverter and the 4013 dual flip flop, so I am surmising that this is a
hardware problem.

Can somebody fill in the blanks?

-Butterfly Bill

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