Toms Hardware 20 Must Have Windows 7 Utilities
"Released in September 2009, Microsoft's aim with Security Essentials (MSE) was to provide customers a means to improve Windows security without draining their pockets. While most consumers don't associate Microsoft with anti-virus solutions, it was only a matter of time before the company took that extra step in integrating anti-virus capabilities into the Windows operating system."
Toms Hardware have produced a list of what they consider to be their top 20 must have utilities for Windows 7. First on the list is Microsoft Security Essentials which I agree is definitely a must have and Daemon Tools, Gimp and 7-Zip are also tools on the list that I have. Go check it out and see how many you have already and how many you maybe didn't know about but may help you.