I don't know, but probably not.
Most mobos of that sort of age used jumpers to control Bus speeds and stuff rather than BIOS adjustments. See if there's anything on the mobo that lets you select between some or all of 100, 105, 112, 120, 133 or similar. Although since you'd be overclocking your RAM, and probably PCI/AGP bus too, I wouldn't hold out much hope.
People like HP, dell, IBM, etc by and large don't use enthusiast-friendly motherboards in any of their computers, so I suspect you'll find very little is tweakable.
I haven't looked into your actual PC, but I suspect you've got a dead end there. Crashman might have some idea though.
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Winnie 3200+ @ ~2.5Ghz, ~1.41V
1Gb @ 209Mhz, 2T, 3-5-5-10
Asus 6800GT 128Mb