Once the process is completed, the 'Check' window will automatically exit and you should be able to launch your game. Steam will verify the game cache files (GCF's) - this process may take several minutes. Select the 'Local files' tab and click the 'Verify integrity of game cache.' button.

Right click on the registry value 'serial_key' and select 'Delete.'įrom the Library list, right-click on 'Mount & Blade' and select 'Properties' from the menu. The data contents of the registry entry 'serial_key' are your CD Key. Note: In 64-bit operating systems, this path may begin as: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\ Navigate to the following registry key: HKEY_CURRENT_USER\Software\MountAndBladeKeys Go to the 'Start' menu, select 'Run', type 'regedit' and click 'OK'. If it still doesn't work, please try deleting your Mount & Blade registry entries: Verifying the GCF Cache solves most CD Key issues for most users.

If you are running in Windows XP, take the following steps:Ģ) Go to the 'Start' menu, select 'Run', type 'regedit' and click 'OK'.ģ) Navigate to the following registry key: HKEY_CURRENT_USER\SOFTWARE\VALVEĥ) Check the boxes for 'Admin' and 'System' to 'Full control' and 'Read'.įirst, verify the GCF Cache for the game:

If you are running in Windows Vista, Windows 7, or Windows 8, please completely exit Steam, and right-click on the shortcut which you use to launch Steam and select 'Run as Administrator.' I am finally able to play multiplayer in a server! Here is what Steam finally messaged me on how to fix it:

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