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Please note: crwld.org is not responsible for any damage you may do to your computer by following the instructions bellow.

Hello there

This post is for those who are able to play Call Of Duty 4 in single player mode, but are experiencing multiplayer crashes (CTD’s).
Most of the times (not always) this is due to RealTek(TM) sound drivers. If you have a RealTek(TM) on-board sound card then this is very likely the reason why you are having problems when running on multiplayer. Apparently there are also some problems with Sigmatel® on-board sound cards. The solution presented in this post however, is for RealTek(TM) sound cards only. For Sigmatel® owners you may want to try to update your audio drivers from dell.com.

Below there are a few known fixes for this problem (only one is guaranteed though).

Not guaranteed solutions:

Solution 1: Plug in a microphone/headphone into your microphone and headphone jacks.

Solution 2: Go to ‘Control Panel -> (Hardware and Sound) -> Sound’ and one by one, select all the audio devices in the ‘Playback’ tab list, go to ‘Properties’, select the ‘Advanced’ tab and disable the ‘Give exclusive mode applications priority’ option. Click ‘Apply’ and ‘Ok’.
Remember to do this to all the playback devices in the list.
If this doesn’t work, try to do the same to the ‘Recording’ tab devices in ‘Sound’ properties also.

Solution 3: Go to ‘Control Panel -> (Hardware and Sound) -> Sound’, select the ‘Recording’ tab, right click in the window and enable ‘Show Disabled Devices’. ‘Stereo Mix’ should now be visible…right click it and ‘Enable’ it. Press’Ok’.

Solution 4: Update your RealTek(TM) sound card drivers.

Guaranteed solutions:

If you tried all the solutions above and you’re still experiencing problems when playing Call Of Duty 4 in multiplayer then you probably have to uninstall your sound card drivers to fix the problem.
Before you proceed though, it is recommended for you to take note of the make and model of your sound card for later reinstallation.
To remove your sound card, go to ‘Add/Remove Programs’ search for your RealTek(TM) sound card drivers and uninstall them.
If you can not find your drivers there, then go to the ‘Device Manager’ in ‘Control Panel’, and look for your sound card (probably under ‘Sound, video and game controllers’). Right click it and select ‘Uninstall’. After that, reboot your pc.
This should fix your problem.
If you’re running Windows Vista, your sound card default drivers will be installed automatically and you should not witness any sound problem. If you’re not running Windows Vista and your sound card does not work then you may want to reinstall your sound card drivers.

Happy Gaming!

This solutions where found at:
gamingnewslink.com
kioskea.net

Note: This problem exists till Call Of Duty 4 version 1.7 at least. It is possible that future versions/patches of the game correct this problem.