Windows defender program is one of the most amazing programs or facilities newly introduced by Microsoft Corporation in Windows 10. It comes to your computer automatically if you have updated your old version to Windows 10. The program acts like an antivirus to scan and remove the errors and infections from the PC. But sometimes while you run the program in computer to scan it, you get Windows defender error 0x80508015. After the occurring of the defender error 0x80508015, you cannot be able to scan or remove infectious files. Therefore, it is very important to fix Windows error code 0x80508015 using the manual or automatic error fixing methods recommended here in this article. For automatic fixing, you should download and install Advanced System Repair Tool in the computer.