Video And Audio shut down during game play

[michaelasr]

This problem seems to affect only games run on my
HP pavilion model m9510f running Vista Home Premium 64bit
A NVIDIA GeForce 9500 GT video card. Driver ver. 8.17.12.6099
With Intel(R) Core(TM)2 Quad CPU Q8200 @ 2.33GHz, 2333 Mhz, 4 Core(s), 4 Logical Processor(s)
Realtek High Definition Audio sound card. driver 6.0.1.5789

After a few minutes I lose the video and a short time after that I lose the audio.
I need to hold  the power button to reboot.

The games run fine on my older system running Vista Home Premium 32bit
This is making me nuts
I would greatly appreciate any help.

[Spoiler]

What are the specs of the machine that they run good on? Have you tried to update your video drivers?

What are the names of the games?