You do not need to reinstall the game to fix this issue. Try these proven troubleshooting steps in order. 1. Enable a Microphone or Plug in Headphones
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Check the box at the bottom that says . Click Apply and OK . 3. The "Rename mssmp3.asi" Trick You do not need to reinstall the game to fix this issue
Ensure at least one (Microphone) is enabled and set as default. exeerrmssinitfailedmp call of duty 2 download link
I can provide specific registry patches or alternative sound file links based on your setup.
Here is a guide to resolving these startup issues and finding safe ways to download the game. How to Fix Multiplayer Startup Errors