: Click the gear icon next to the Play button > Scan and Repair .
These classic Call of Duty games were designed for older versions of Windows. You can help them run on modern systems.
The error is annoying but almost always resolved by reinstalling Visual C++ runtimes and disabling audio enhancements . If you’re in a hurry, start with step 1 – that solves it for about 70% of users. Call of duty exe err mss init failed 150
Back up your registry first (File > Export).
Run the game and launcher as administrator : Click the gear icon next to the
: Many legacy CoD titles fail to boot if they detect no active recording device. Simply plugging a 3.5mm jack into your microphone port can bypass the initialization failure. Enable "Stereo Mix" :
Strangely, the Miles Sound System engine will fail error code 150 if it detects absolutely no live physical output devices connected at launch. Ensure you have a physical pair of headphones or speakers plugged directly into your system's 3.5mm audio jack or USB slot before clicking play. Summary Checklist for Launching The error is annoying but almost always resolved
, the game fails to launch if it doesn't detect an active recording device. Right-click the speaker icon in your system tray and select Recording devices Right-click in the list and select Show Disabled Devices Stereo Mix appears, right-click it and select Verify Game Files : Corrupted
Open your Windows Sound Control Panel, go to the Recording tab, right-click any empty space, and check Show Disabled Devices . If Stereo Mix appears, right-click it and choose Enable . 5. Verify Game Files or Replace the MSS DLLs