In the Windows operating system based computer, you get so many features and services. Windows defender program is also one of those services. Sometimes it happens that when you launch this program in the computer, you get Windows defender error 0x80508012. Occurring of the defender error code 0x80508012 happens due to missing or deletion of important system files associated with this Windows defender. Windows error 0x80508012 will make you unable to scan the computer properly. In this critical error situation, you should try to fix it either with manual or with automatic fixing methods. You can download and install the Advanced System Repair Tool to fix Windows errors automatically.