Microsoft just released a new version 4.1 of "Enhanced Mitigation Experience Toolkit" (EMET). EMET is designed to help prevent hackers from gaining access to your system. It hardens your system against various exploit techniques by making programs run in a restricted mode. Because EMET uses general security methods, it does not have to be updated with signatures for known viruses or for the characteristics of specific programs. EMET works with Windows XP SP3 and up, including Windows 8. It requires .NET Framework 4.0. The updated version can be installed over existing previous versions.
EMET Download Link: http://www.microsoft.com/en-us/download/details.aspx?id=41138