Windows defender program is a very dynamic and very much useful program in the Windows 10 computer. You can use it as an antivirus that can scan and find out the errors and corruptions in the Windows. But sometimes it happens that when you try to launch the Windows defender in the computer, you get Windows defender error 0x80501107. Occurring of the defender error code 0x80501107 is a very critical situation due to which you cannot be able to remove the Windows errors. In this condition, you should go with some manual or automatic error fixing methods given here in the article. You can also use Advanced System Repair tool in the computer for automatic fixing of the issue.