Windows defender program is an inbuilt program in the Windows operating system. You may get it in various versions of Windows operating system. It is used to scan and remove the infectious or corrupt files or programs of the computer. But sometimes it happens that when you try to launch this program in the PC, you get Windows defender error 0x80508027 and scanning will not be held. Mainly the defender error code 0x80508027 comes to your computer due to the missing or deletion of the important files associated with this feature. The error will make you unable to access this program as well others. In this situation, it is very important to get rid of the Windows errors either with manual or with automatic error fixing methods. You can also download and install Advanced System Repair tool for automatic fixing of the error.