You get many features and services in the Windows computer. These features are very important for completing the various technical tasks. In the latest version of Windows i.e. in Windows 10, you get Windows defender service. This one of the most important service you get in this version. By dint of this service, you can scan your PC and find out the errors it gets. But sometimes, when you launch the Windows defender program, you get Windows defender error 0x80501103 on the computer screen. You usually get the error due to deletion or missing of the important files associated with it. After getting the defender error code 0x80501103 in the computer, you cannot remove the infectious files using the service. Therefore, you should go through either with manual or with automatic error troubleshooting methods given here. For automatic fixing, you should download and install Advanced System Repair tool in the PC.