hi guys,i recently encountered a problem with my computer.its a dual bios amd64 3200+.The problem with it is that everytime i turn it on it restarts and it does this thing over and over again.it doesnt even reach the profile selection screen.it never use to be as bad as this.Before it just freezes now and then and blue screen appears saying Stop:0x0000009c
what can i do to fix this?is there anyway i can overhaul the system without deleting the operationg system since i have lost my windows xp cd wen we moved out?