HELP!! Gaming and video problem computer shuts off

Ok so heres the deal, whenever i watch a movie or play a game my computer will just shut off. I checked and saw my video card was running a little hot, but not to bad so i thought that it could be my power supply, so i swapped it out and put in a BFG 550 watt supply. Computer then worked good for a couple weeks so i decided to try the video card and swapped out the Nvidia GT120 for a ATI radeon 5770. I fired it up and im still haveing the same problem. Anyone have any ideas? this is frustrating the heck outa me. Also my quad core cpus temps are fine to. Any help would be appreciated thanks.

 

Hi, I'm have windows Vista Home Premium 64 bit with service pack 1 installed,

In the application logs i have to errors with WMI as the source and event ID 10. I looked back and every time the machine crashes this is the error. Then in the system logs i have an error source Service Control Manager Eventlog Provider and event id 7026 and the description is the following boot start or system start drivers failed to load cdrom.

My internal case temps are also not a problem as i have the sides off with another fan running blowing into the case. My processors are also running in the 40's C range.

I just updated the graphics drivers and removed the nvidia drivers, though i found out that my oem motherboard is a nforce board and had to reinstall the ethernet drivers as i lost my internet then. That shouldnt be part of the problem should it? Especially since it was crashing before the card swap.

And the only yellow mark i have in the device manager is an 6TO4 network adapter.

And i dont have any codec packs installed that i know of

 

I'm not sure what version the mother board is i just know it is an Nforce board that came with the computer. I've already reinstalled the drivers and i tried running the script but the computer wouldnt let it run.

 

Most manufacturers will silk-screen the model number onto the motherboard, either somewhere around the RAM slots, or by the PCI slots. If you can get into your PC, grab a flash light and go number hunting.

Or you can download and run Speccy and look under the motherboard category there.

 

ok i looked up my motherboard with speccy and its a gateway FMCP7AM With a nForce 730i chipset.