Comp shutting off

Ever since I installed Vista, my system shuts down randomly.  Sometimes it
takes a minute, sometimes it takes 10 minutes.  I will just be working and it
shuts off.  Windows does not shut down, the system just shuts off.  It did
not do it with XP.  I rolled back to Xp, and it stopped doing it, then I
reinstalled Vista, and it is doing it again.  I have Vista Ultimate, but I
have always tried home, and it does the same thing.  I have a Pentium D dual
processesor, with 2 GB of DDRII memory.  Any help or suggestions would help.
I am also running and ATI 1300XL graphics card.  I have updated all my
drivers.  It is an ECS Elite 945A motherboard.  Thanks.

Comp shutting off

Hello,

I don't understand: Vista doesn't shut down, but the system shuts off? What
does it do then exactly?

Greetings,
P. Di Stolfo

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The machine just shuts off randomly.

The machine just shuts off randomly.  I'll be doing something, surfing the
net, using word, checking email, playing a game, and the machine just turns
off.  Did not do it when I was using XP.  Wondering if there is a piece of
equipment that is causing a problem.