Be sure to update your third-party programs when prompted to, and if programs don’t remind you, manually check for updates from time to time. True, these updates often include new features you may or may not care about, but they often deliver critical security patches behind the scenes as well. For a helping hand, check out Secunia Personal Software Inspector (PSI), which scans the programs installed on your Windows system and lets you know which ones need security updates (plus provide download links).