In your Windows computer, Microsoft has developed Windows defender program. It is an inbuilt antivirus that helps you to scan the computer to get rid of any virus infections. But sometimes it happens that when you try to start, scan or update the antivirus program, you may get Windows defender error 0x8050800C. It is really a very chaotic situation that after getting the error, you cannot be able to access the computer properly and removal of infected files is also infected. Therefore, it is very important to fix defender error 0x8050800C in Windows. You can go through the methods given here in this article. You can also use Advanced System Repair tool for automatic troubleshooting of the issue.