Fix: This is a resolution bug. Edit C:\Users\YourName\Documents\Battlefield 3\settings\PROF_SAVE_profile with Notepad. Find GstRender.ResolutionWidth and Height. Change to your monitor's native res.

Before you download anything, you must know this: A repack is generally only useful for the Single Player campaign.

Fix: Repacks come with an emulator (like SmartSteamEmu or Goldberg). Make sure you didn't accidentally delete the SmartSteamLoader.exe or OrangeEmu64.dll. Launch using the provided LAUNCHER.exe, not the original `BF3.exe**.