Did the Windows Vista Ultimate installation CD that you were using had SP1 included on the instalation CD?
What order you follow installing the drivers? For example: 1 Chipset 2 Audio 3 Video....
What Vista is it? 32 bit or 64 bit?
Thank you for your response... and yes it does have sp 1 ( 32 bit) on it and with vista it didn't even allow me to install the drivers myself, it did it automatically. When I did it myself in XP... I had tried it multiple ways but in the exact order I don't know... just every time... no matter what order I installed the drivers the computer shut down right away after I had installed the driver for the network card part of my board.
I doubt the board or software is the problem. It sounds like something is aging; a hard drive, power supply or graphics card. Depends on what you're doing with the computer and the quality of components. You say you narrowed it down so maybe I'm wrong but this motherboard can take a hit and keep on ticking.