
Offline definitions are also listed for both products.Īn offline bootable version known as Windows Defender Offline is in particular useful as a bootable Windows Defender Offline USB can be prepared on a working system and booted from in a problem system. For Windows 8.1 it is integrated into the Windows OS as part of Windows Defender. Microsoft Security Essentials is a free antivirus program which can optional installed for Windows XP (32 Bit), Vista and 7.
