Ok, here's something I've thought of:
1.Disable any performance pushing options in the bios.
2.Set the mem timings to default along with the CPU ('auto'
3.Disable your onboard video.Try to be sure you've killed it,or just remove your NVidia Ti card and boot using your IGP. That may be the problem you solved last time installing WinXP, and now you can't.
4.Merely an option, but still worth to suggest - remove any unnesessary fans or other power draining sourses, for 2800+ demands more power, and tends to get hot.
Be sure you're using CPU's certifiend HS and fan.
5.Try to update the BIOS.
quote:A.M.D = All Men Desire.
System:HEC 475Watt.AMD Athlon XP-M2500 IQYHA0351MPMW.
Abit NF7v2*Sp97*NB1+delta*A-DATA DDR500
MSI 'the rock' RX9800*WD800JB
*firstname.lastname@example.orgVemail@example.comV (CPC off)