A few words of thanks would be greatly appreciated.

COD 4 crashes - iw3mp.exe has stopped working

Call Of Duty 4 (COD 4) runs well on the single player game option, however, there are problems when you switch to the multiplayer mode. First, ascertain your computer model and look for a sound card update. If video games are installed on a secondary partition, download the latest BIOS updates for your system's motherboard. Some soundcards need additional instructions and setting the sound tool is done by enabling Stereo Mix. In addition, a USB microphone plugged in the system's USB port may solve the issue. It is observed that while connecting a microphone jack to the sound card, a pair of headphones or RCA connectors will eliminate the problem. Plugging into a microphone jack can result in breakdown of components in your system.


I have installed COD4 on my Windows machine. All other games work correctly, but when I try to run COD4 it crashes.

This is a very common problem caused by the system's audio device.


  • Go to Start > Control Panel
  • Double click on the Sound Tool
  • Click on the Recording tab
  • Right click and select "View Disabled Devices"
  • Enable the Stereo Mix

COD4 should now run normally


Thanks to gragrand for this tip.

Tip inspired from this post on the forum

A few words of thanks would be greatly appreciated.

Ask a question
CCM is a leading international tech website. Our content is written in collaboration with IT experts, under the direction of Jeff Pillou, founder of CCM.net. CCM reaches more than 50 million unique visitors per month and is available in 11 languages.
This document, titled "COD 4 crashes - iw3mp.exe has stopped working," is available under the Creative Commons license. Any copy, reuse, or modification of the content should be sufficiently credited to CCM (https://ccm.net/).