fsb question

I see alot of people with the same system are hitting 200fsb but I can't get over 175-180 without the computer rebooting and error messages.

I tried optimal and aggressive timings with the ram, but does not help, cpu interface enabled and disabled.

I started getting messages about checking hard drive and ran scandisk, everything is fine, if I lower fsb to 166, no message about hard drive.

I also recieved a serious error message has been detected with your software.

I have formatted the drive and reinstalled everything but still not running good. Any ideas would be welcome
==============================================
Abit NF7 Rev 2.0
XP2500 Barton AQXEA 0325 VPMW
2X256 mb OczPC3500EL Gold dual channel ram
AQXEA 0325 VPMW
Bios 18
60gb Western Digital 7200 rpm

Cooling?? Voltage?? Power Supply brand??

Have you tried lowering the CPU's multiplier?

I lowered the multiplier to 10 and upped the fsb to 200 and it booted, no messages so far.
I feel pretty stupid for not thinking to lower the mutliper first, brain freeze LOL

cpu core voltage 1.8
ddr ram voltage 2.8
chipset 1.6
agp voltage 1.5

sys temp 35c
cpu temp 50c
video card geforce4 440mmx 8X