The leading cause of infections from viruses, trojans, worms, and all the other nasty stuff out there is out of date software.  On an average PC, there are many programs that are either out of date, or are no longer even supported (end of life).  So how do we know who what when where to update and patch? 

This is how: Secunia PSI.  This program scans the PC, tells you what needs to be updated and even provides a link to the download site for that program!  I've put it on about 20 PCs so far and only had a slight issue on one, so overall a great application, HIGHLY RATED.  Give it a try and let us know what you think.