Microsoft has released a tool called EMET which is a free tool available for Windows 8, Windows 7, Windows Vista, and Windows XP. The Enhanced Mitigation Experience Toolkit (EMET) is a utility designed to help users block hackers from gaining access to their systems through common attacks. EMET enables users to manage security mitigation technologies that help make it more difficult for attackers to exploit vulnerabilities in a given piece of software. EMET helps protect your computer from new or undiscovered threats until they can be addressed through formal security updates.
Once installed, EMET works quietly in the background without interrupting your computer use. Like any security tool, EMET doesn’t guarantee that you’ll never have any problems, but it does make it much harder for an attacker to succeed.
You can download EMET here.