Call Of Duty Exe Err Mss Init Failed - 150

Clear game cache and user config

Antivirus software can sometimes mistakenly identify mss32.dll as a threat and quarantine it, causing the error. Temporarily disabling your antivirus to test if this is the cause is a good step. If it works, add an exclusion for the entire Call of Duty game folder to prevent your antivirus from scanning it in the future. Call of duty exe err mss init failed 150