Well have you ever checked the hardware monitor section in your BIOS, this will show you what your powersupply is running at along with Fan speeds and CPU Temperatures. If left unchecked most BIOS’ will not warn when there is an issue with the powersupply, depending on the severity of course. For instance I had this Pentium D System, Pentium 4 at 3.6Ghz, running a SATA STRIPE. The Chipset was Nforce4. The 550watt power supply installed was made by Antech. A pretty good system considering it was 1 year old. We decided to install Windows XP x64 Edition and immediately noticed slow downs and programs wouldn’t install properly. Well we tinkered with some settings for a while and finally decided to pull the plug, wish I would have done it earlier, but hey hindsight is 20/20 right? No ones perfect.
Anyways the moral of the story is that the powersupply wasn’t supplying the mainboard with the proper amount of voltage in the 5V range, it was out by more then 5% and that is bad for the motherboard, CPU, and I/O.
We ended up replacing the powersupply and the 5V voltage was now stable.
Unfortunately well have to reinstall the OS, as there is some residual corruption. Can someone say FORMAT!!!