Minimize the game (Alt+Tab) to the system tray while keeping it running. EasyAccount.exe as an Administrator.
To ensure the game saves this new data to your disk permanently, change one minor setting (like your screen resolution, a keybind, or an item in your custom class) and then close the game normally through the main menu. Troubleshooting Common Issues "Server Disconnected - Downloaded File is Corrupt" CoD4 EasyAccount for all version.rar
Troubleshooting (brief)