Hehe,
Man...I had the same PoS ComCrap 5170 for the longest time. I got it at 40% off retail as an open box...apparently someone returned it 2 days after they bought it for the same reason you are hating it...you *CAN'T* overclock it at all. There's two reasons for this. A) Compaq sux and they locked the FSB multiplier on the board (there are no FSB multipliers and as you know, the BIOS sux and has like 4 options, none of which are FSB multipliers) and B) Intel locked the chip multipliers beyond the middle P2's.
The best thing you can do for increased performance is to get a slotket or find yourself a slot1 processor and upgrade your chip. There are rumors that the 440BX on that Compaq will support up to a PIII-850 Coppermine, but *only* if it is the 100mhz FSB chip. The highest speed supported by Compaq in their 2 year old bios update is a PIII 500, which I used in there for about a year and a half. But that bios update also disabled the mobo jumpers for cpu id, so it makes sense that the 850mhz should work b/c the bios is just reading the speed the chip states.
Truthfully, I'd upgrade into the world of Athlons for a bit more money and free yourself of the OEM curse. I got a barebones for $340 with a lot more than you'd expect (1.4 athlon, a7v133 mobo, enlight 7237 w/ 300W PSU, Volcano2 HSF, keyboard and mouse), and if you ever upgraded anything in your 5170 you can port it over np. I pretty much upgraded everything else in my 5170, so I moved my v5, sblive, 30 gig Quantum, CD-RW over and was ready to rock. If you are intent on staying with the 5170 I'll sell that PIII 500 for pretty cheap if ur interested tho
Chiz