Microsoft often releases some updates for the Windows operating system. In the current released version of Windows 10, you get some new features and services. Windows defender is one of those features. It is used as an antivirus in the Windows 10 that will scan and fix the infections occurs in the computer. While you launch the Windows defender program in the computer to scan the PC, you get Windows defender error 0x8050A004. You may get the defender error code 0x8050A004 due to corruption of the system files or missing DLL files. You should go through the manual or automatic error fixing methods recommended here in this article. You can fix Windows error code 0x8050A004 automatically using Advanced System Repair Tool.