Try clock speed at 200 and leave the multiplier at 11. Set the Ram voltage to at least 2.7 and Cpu voltage to 1.725-1.75. Set the CPU/Ram ratio to 1:1 or 100%
IF you are new to this them you may wanna do more studing on that mobo you got and really read the manual for that mobo, so you can get familiar with each of the settings in your BIOS..
Another thing is that most Barton 2500+ do not like going higher than 193 with the multiplier still at 11. You may have to drop it to either 10.5 or 10.
F-DISK-Format-Reinstal DO DA!! DO DA!!