How to fix IW3mp.exe on Call of Duty 4

Written by john lister Google
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How to fix IW3mp.exe on Call of Duty 4
A PC headset could be the key to your Call of Duty 4 problems. (Stockbyte/Stockbyte/Getty Images)

Call of Duty 4 (subtitled Modern Warfare) is a game released by Activitision. In the PC edition, you may see error messages referring to "IW3mp.exe", which is one of the key files and launches the game in multiplayer mode. This is caused by problems with soundcards while running multiplayer mode. You can take several steps to try to fix the problem.

Skill level:
Moderately Easy


  1. 1

    Check you have installed all updates and service packs to your edition of Windows. Press the Windows key, type "windows update" and press the "Enter" key to see details of whether any updates are available.

  2. 2

    Update your drivers from the appropriate website if you have a RealTek or Sigmatel sound card. (See resources.) If you don't know what type of sound card you have, press the Windows key, type "system information" and press Enter. On the resulting menu, select "Components" and then "Sound Device" to see a list of your soundcards and other audio components.

  3. 3

    Check you have the latest BIOS for your motherboard if you have installed the game on a secondary partition. Check your computer's operating instruction manual if you need to find out how to update the BIOS.

  4. 4

    Alter your Windows sound settings if you have a RealTek soundcard. To do this, click on "Start", then "Control Panel", "Sound Tool" and "Recording." Now right click in the box marked "Playback Devices" and select "Show Disabled Devices." If "Stereo Mix" is listed here, click it to switch its setting to enabled.

  5. 5

    Check your soundcard ports if none of the previous steps have worked. These may be at the front or rear of your computer and often have a range of colour-coded sockets and/or icons. Even if you don't want to use the speech features in multiplayer, make sure you have a plug of some kind inserted into the microphone socket as this can solve the "IW3mp.exe" problem. The plug does not have to be from a microphone: it could also be from earphones, a phono adaptor, or some other device with a plug that fits the socket. Alternatively you may solve the problem by plugging a USB microphone into your computer.

Tips and warnings

  • Restart your computer after each of the listed steps and then start the game to check whether or not the step has worked.
  • Although you can use a non-microphone plug to fill the microphone socket and potentially solve the problem, do not plug in anything that is powered as this could damage your computer.

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