redsnail,
Suntek 300W approved for AMD and Pentium CPU's.
First off, I think you are running under powered for your system. I would suggest getting a good name brand Power Supply. I really like the Antec TruePower Series. (Get at least a 400W Power Supply that is from a good name brand.)
Then the easiest fix for your OS would be a repair with the Windows CD. Chances are it will run a scan of the drive, make a repair of the drive itself and then boot normally without having to go though the full repair.
Take Care,
Richard
P.S. TCS, it looks like our posts crossed again. (I am glad to see we still think alike.)