Sys_build

I recently built my computer from scratch. I installed Microsoft Windows XP Professional SP3 32-bit for System Builders, the computer boots up, but once it gets past the windows loading screen it always says system is restarting... then flashes the message " A write operation was attempted to a volume after it was dismounted." I've seen the same problem happen to other people on other blog sites but I have never found a solution to my problem. This is my first computer build and after spending over a thousand dollars this anticipation is killing me! PLEASE HELP!!!