Not sure what my problem is here. I've consulted everyone I know and nobody can come up with a solution.

Randomly, my PC reboots itself. It happens around once an hour. It sounds like a fan is speeding up, maybe the PSU, and then it just reboots.

Also, when I turn the PC off, windows [unloads?] but the PC still sits Idle. All the fans stay on, as well as the HDD light, and the power light. I don't understand, it does not shut down unless I do it manually.

Third, my microphone refuses to work with my SigmaTel Audio driver. I have two SigmaTel Audio sound devices. I do not understand why. In any audio configuration (Ventirlo for example) I have the option of choosing SigmaTel Audio 1 or 2. I'm hypothesizing that one represents the back ports, and two represents the front?

I used a Dell Windows disc to install Windows XP onto a custom built PC (Created by me and a friend) would this be causing me problems? I can give the specs if neccessary, but I'm not sure if they would be.

P.S. Any help is appreciated, I'm really desperate.