If the service reset doesn't work, specific "packs" (like Multiplayer or Warzone) might be missing from the core installation. PC (Xbox/Battle.net): Select the game, click the Settings (gear icon) , and choose Verify and Repair Scan and Repair Navigate to the Call of Duty HQ main menu, go to Settings > Manage Files

Error 0x01 can have a significant impact on your system, including:

Error 0x01 is a hexadecimal code that indicates a critical installation file is missing. This error typically occurs when the installation process is unable to locate a required file, resulting in a failed installation. The error message may vary depending on the software or application you are trying to install, but the essence remains the same - a crucial file is missing, and the installation cannot proceed.

Leftover data from a previous, failed installation can confuse the new installer.

Old temporary files can sometimes conflict with new installations.