if it's a 250, I would strongly recomend upgrading to a 300 or 350 (although unrelated to your current problem, with the cards, and stuff you use in your machine, you are probally on the brink of maxing that 250 watt out, the V5 takes alot)
Are you sure, that your CPU wasnt already 233Mhtz when you were running win98, windows 98 does not require as much reasources as Windows 2000, and I have gotten 98SE to run very nicely on Pentium 166Mhtz systems, the reason I asked is that I looked up the specifications for your motherboard, and it does not exceed 233Mhtz for AMD K6 type CPUs
as you can see from the jumper settings, there is no settings for higher than 233Mhtz
(Spec Sheet)
yours is apparently the classic original socket7 that did not support past 233Mhtz.
Now unless of course, microstar isnt showing me something, but from the jumper settings, I dont see how you could possibly been running at 450 (you would not have noticed the speed as much on 98, or lower systems, you would have on win2k)
[ 10 minutes later ]
now I am looking at the manual for the 4th revision of that board, and it does show K6-2 450 jumpers, so my next question is, what revision is your motherboard (usually shown on the boot screen as rev.) Karl Blessing aka kb244{fastHACK}