Hi FOZZ
I experienced a similar problem before..
My Win2k box just reboot itself without a blue screen when I burn a CD, scan a photo thru USB scanner and browse the net at the same time.
I suspected that the problem was due to ability of Power Supply that couldn't supply enough voltage to the system. Then, I move my HD from UDMA33 to HighPoint UDMA66(I guess my HD and IDE CDR draw the power from same source when both plug in UDMA33) and Up the CPU core voltage to 1.95v.
The problem is solved before I buy an more powerful power supply.
My system:
Win2000 Professional 2195
ABIT BP6
Dual Celery 400 x 2 @504 vCore 1.95
256M Buffulo PC100 CL=2 RAM
ASUS V3400 TNT using lastest W2K driver
Voodoo2
SB Live value
Barebone 1394 adaptor
Segate 27G UDMA66
Panasonic CDR