I have a desktop computer with an HP Compaq cabinet. It may have been customized somewhat by the person I bought it from, but then he has dealt in HP products for years, so maybe not.
It has an Intel Pentium 4; the two clock speeds are 2.80GHz and 2.79GHz. RAM = 1.50GB.
It was recently upgraded by a clean install, (reformatting the HD), from XP to Win 7 Ultimate. (At the end of April).
The problem in question existed before the upgrade, when it had XP. It used to be less frequent but it is doing it almost every day now.
It will just suddenly stop what I'm doing and reboot. No BSOD with any message about an error of any kind, it just winks out and goes into reboot.
I have never been a "hardware person" so I have no experience with dump files or where to find them or what to find in them. I have a B.S. in computer science and have worked as a programmer - mostly with mainframes. I'm familiar with a lot of terminology and concepts, but not how to apply them to this.
One question would be, does this site (B.C.) have tutorials about debugging principles?
I would like to try to address this problem before too much damage accumulates. Windows is amazingly resilient, but the flip side of that is it may be working around a lot of internal disorder, and that may be why it is getting more frequent.