Among the additions coming to Windows 8 should be an Apple-like file checking system taht would refuse to run files known or suspected to be rogue. Microsoft's SmartScreen, a system first found in Internet Explorer and Windows Live Messenger, will check files for whether they're malware or otherwise illegal and could stop them from running. The method would prevent 'social' viruses, where users end up bypassing their usual safeguards because they think it comes from a known source.
