Beeps once every three minutes like clockwork

Thanks for potentially helping with this.

My computer does a one beep thingy every three minutes like clockwork

(sounds like a booting up beep) It just started tonight after I was
using
Kazaaaaaaa... (I know) But after running my two updated anti-virus
programs, I still cannot get it to go away. I also did try an updtaed
Ad-aware and Spybot to no unusual avail, so I'm really stumped.

I Googled the *** to death, but to no avail. (I like that expression).

Any help would be appreciated.

Running xp.

Thanks.
COLIN

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