Secunia Personal Software Inspector (PSI) - FREE PC Security for Home Users

Used by millions of home users around the world.
The Secunia PSI is a FREE security tool designed to detect vulnerable and out-dated programs and plug-ins which expose your PC to attacks. Attacks exploiting vulnerable programs and plug-ins are rarely blocked by traditional anti-virus and are therefore increasingly "popular" among criminals.

Download your copy: http://secunia.com/vulnerability_scanning/personal/