-Windows 8.1 comes with Windows Defender, even though it has no notification tray icon which will allow the user to know the status of their security it's also enable to perform an auto update and scan -Windows 7 has MS Security Essentials, which can be downloaded from the MS website Note: Security Essentials is a lower level of Windows Defender -Uses BIOS routine only to boot -UEFI included in 8.1 making it harder for malware to affect the bootloader (UEFI is more advance than BIOS routine and it allows for a secure boot w/platform firmware and new policies and specifications) -Windows 7- confines the bootloader program files in the 1st partition of the hard drive called the "system reserved" - The boot loader files in this system partition are fully concealed and isolated, this eliminates the chances of malware -Windows 8.1- extends secure boot implementation of Windows 7, using trusted keys in boot manager to ensure that only properly signed and authenicated components are allowed to execute.
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