I have been writing about this problem since I built the new PC. Well today I found the culprit causing the lockup in COD4.
The audio system on the motherboard!!
I have an Intel MB that has this IDT HD audio system on it. Today, I removed all the software for that audio and also
went into the BIOS and disabled the HD audio system. I also removed the updated NVidia drivers and replaced them with
the 2nd generation 303.23. I did not install any of the other software for NVidia graphics card. Just the driver.
When I restarted the PC and went into COD4, I was astounded by the clarity of the game and the FPS I am now getting.
I was getting 48-66 fps before and the game would glitch all the time, especially when bombs or nades went off by me. The
game would just halt for about a 1/2 second or so. No matter what I did to the video settings, this glitch would not go away.
When ever I went into a building or just turned around, the video would stop.
So, it had to be audio. And it was.
The remarkable thing was this. I still have audio through my USB headset. So the system must have a basic audio setup
built into the board somewhere. I have just finished two maps and not a glitch. The image is really nice and my FPS is over
It is nice to be able to play again.