![]() ![]() After which, you should be able to Enable Microsoft Defender protection. Hence, the need to remove all previously installed Antivirus programs from the computer. Remove Third-Party Antivirus Programsīy default, Microsoft Defender gets automatically disabled, when it detects the presence of any third-party Antivirus program being installed on the computer. Tip: In stubborn cases, the only way to fix this problem is by using Reset This PC option (See Last Method below). In certain cases, the problem could also be due to Microsoft Defender being blocked or disabled by Malware/Viruses and other reasons. The OfflineScannerShell.exe then looks for the file mpam-fe.exe or mpam-fe圆4.exe and extracts the latest engine and definition files used by the Windows Defender Offline tool and finally the Windows Defender Offline tool itself is launched and ready for use.If you Can’t Switch ON Microsoft Defender, after uninstalling McAfee or another Antivirus program, the problem could be due to traces or previously installed Antivirus program still being active on the computer. Once WinPE is booted OfflineScannerShell.exe is launched. The Winpeshl.ini which is used by winpeshl.exe contains the following command:ĪppPath = "%ProgramFiles%\Microsoft Security Client\OfflineScannerShell.exe" The startnet.cmd only contains the wpeinit command which instructs WindowsPE to install Plug and Play devices and load network resources. You can either mount the boot.wim using imagex.exe or use 7-Zip as explained here. The Windows Defender Offline Beta media is now complete, let’s take a closer look at the content within the boot.wim file that is stored within the Sources folder. Unfortunately the Windows Defender Offline Beta media preparation wizard does not have an option to add network or storage drivers, but I will show you within one of my next blog posts how you can customize your WDO boot media. Once the files are downloaded the wizard launches the imagepackage32.exe / imagepackage64.exe that contain the WindowsPE source for the corresponding architecture and finally mpam-fe.exe or mpam-fe圆4.exe is copied to the root of the media. Next for the 32-Bit version the file imagepackage32.exe is downloaded from or imagepackage64.exe for the 64-bit version from ![]() When using the 32-bit version it downloads the file mpam-fe.exe from, when using the 64-bit version it downloads the file mpam-fe圆4.exe from. First the wizard downloads the Windows Defender engine and definition file. The log file OfflineScan.log stored under C:\ProgramData\Microsoft\Microsoft Standalone System Sweeper Tool\Support tells us what happens here. If you selected USB you will be prompted to select the USB drive, if you selected ISO file, you’ll be prompted to specify the location where the ISO file will be stored. Now let us launch the wizard and see what happens here. Now whether you download he 32 or 64 bit version, the content of both files is nearly the same except for the file called mssstool.ini When you launch the downloaded executable mssstool32.exe or mssstool64.exe which are self-extracting archives the content is stored in a temporary folder in the root of your system. First when you go to the download page you will see two download buttons, one for the 32-bit version and one for the 64-bit version.īy clicking on one of these buttons, you will not download the tool itself but just the Wizard that helps you preparing the USB or CD/DVD media. ![]() Now when looking at the log files produced by the Windows Defender Offline tool, you’ll notice Microsoft Standalone System Sweeper tool entries rather than Windows Defender Offline.īut let me start now sharing my findings about how the Windows Defender Offline Tool works. In fact the tool isn’t really something new, those familiar with the Microsoft Desktop Optimization Pack Suite (MDOP) which includes the Diagnostics and Recovery Toolset (DaRT) have probably seen or used the Standalone System Sweeper tool before. While Security Essentials and Safety Scanner run within Windows, the purpose of the Windows Defender Offline Tool is to run offline from bootable USB or CD/DVD media. In addition to the Microsoft Security Essentials software and the Microsoft Safety Scanner Microsoft just recently released another FREE antimalware removal product called the Windows Defender Offline Beta. ![]()
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