Unauthorized BIOS Update Attempted?

For the past few weeks now, whenever I turn on my (desktop) computer, I have been getting the error "0198: System Security - Unauthorized BIOS update attempted." I am then given the option to press F1 to go to setup or F2 to resume. If I press F2, sometimes the computer boots to Windows (XP) but sometimes it just seems to hang: the screen stays black and I can't hear the fans or anything moving.

Help? As far as I know, I haven't done anything with the BIOS. What's going on?

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Clarification Request
Error code

What maybe interpreted as a bios update maybe more of a bios change in status. One common fault is a weak CMOS battery. Replacing that and then actually enter the bios area to configure(verify) the bios as it should be. You will want to note down any bios setting in order to return them as they were. Replacing the battery itself will return to default setting but you need to verify what's proper. The battery replacement is a simple process but having no idea of the bios setup will lean on you. Since, you're running XP suggests an older PC which reflects possible old battery. It appears the F1 key allows you to enter the bios area. If you haven't ever changed the battery and its been several yrs. gone by, its time. Of course, you need to understand the bios setting, review manual and/or d/w the docs(manual) from maker from their support website.

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Did you check prior discussions?
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Obviously I have already run this google search.

The first hit I get is about someone with password problems. One hit says to check that my mouse and keyboard are plugged in (they are). Some hits include a bunch of other errors I do not get about date and time settings/configuration errors/configuration changes. One post is about something that happens after a battery is replaced (I haven't been near any batteries). All the other hits seem to be in Chinese and Japanese which I do not read.

If there is a specific hit you're getting which addresses my precise issue, by all means, link directly to it. However, I'm personally not seeing anything that fits my problem.

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This is why I asked.

Since I see it matching your issue, you may want to try the usual cmos battery replacement since that's cheaper than what we change next.

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