These days the biggest issue with computer security exists between the screen and the chair. Very often these days computers are infected by users downloading seemingly innocuous apps loaded with malware.
Windows 8 is set to help, with two features built right into the OS. The first is screening files with SmartScreen to compare them with a list of known malware and known safe files, and the second is to actually block the execution of files Windows does not know is safe.
Long Zheng who leaked the screen shot notes the second feature is not activated by default, but considering the need to make Windows 8 as plug and forget as possible maybe it should be.
Read more at istartedsomething.com here.