Windows 10 operating system is the latest version of Windows operating system. You may get so many new and amazing features in this version. However, you also get some error issues in your computer while you go through these features. When you launch the Windows defender program in it to scan the computer for the removal of virus and other infections, you may get Windows defender error 557 and the scanning process will get stopped. There are not any proper reasons for the error found. The issue will harm the computer data and important information from the system. Therefore, it is very important to fix Windows error code 557 as soon as possible using the manual or automatic error fixing methods. For automatic fixing, you can download and install Advanced System Repair Tool in the computer.