Fortunately, this
sounds like a pretty easy problem to fix. I don't think the
driver-update utility is to blame here, but rather a poorly timed
CMOS-battery failure. See, most desktop motherboards have a small
battery that supplies power to the BIOS even when the machine is turned
off. This battery might last two years or it might last 10, but when it
fails, you'll often see an error message like the one above. (Your
system will also fail to keep proper time, as the clock is one of the
elements powered by that battery.)
Most CMOS batteries are standard CR2032 "button" cells, which cost no
more than a few bucks at your local drugstore, but check your
motherboard documentation just to be safe. Replacing one is usually a
two-minute job: pop out the old one, pop in the new one, and you're
done. After that, you'll probably need to venture into the BIOS to reset
the clock and double-check other system settings (like boot priority).
Just be glad this didn't happen to your laptop. Laptops use CMOS
batteries just like desktops, but on most models they're difficult--if
not impossible--to replace
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