PSI: Personal Software Inspector
One more thing I should mention is this. Last week I found a very useful tool to keep your compter up-to-date with the latest patches and updates. Secunia has a free program which scans your computer for vulnerabilities in programs. It will tell you that you need to update a program. It's called: "PSI: Personal Software Inspector". It can be downloaded from the Secunia website.
There's also a version called CSI: Corporate Software Inspector for the corporate world. Or, if you want to do it the online way then you can use the OSI: Online Software Inspector. Unfortunately, for this you need Java installed.
For more detailed information visit the Secunia website.