| Problem | Solution | |---------|----------| | “Could not find MW3 installation” | Manually set path in launcher settings. | | Crash on launch | Run as admin; disable antivirus temporarily. | | “Server is different version” | Click “Check for updates” in launcher. | | High ping / lag | Use server browser’s ping column; avoid intercontinental servers. | | No sound in-game | Verify Windows audio device; reinstall DirectX from MW3’s _CommonRedist folder. |
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