Here are the latest versions of these important plugins as of:

2-22-2012

Adobe AIR 3.1.0.4880
Adobe Flash** 11.1.102.62
Adobe Reader X (10.1.2)
Adobe Shockwave 11.6.4.634
Apple QuickTime* 7.71.80.42***
Java Runtime Engine Version 7, revision 3
Mozilla Firefox 10.0.2
   

*Of course, you're better off not installing QuickTime to begin with, unless you absolutely have to.  It is the world's slowest program for no more than it does.  (Click Here)  Also note that Apple's site does not state with any specificity what the latest version of QuickTime is, so I can never guarantee there is not a later version.

**If you are using Firefox or other browsers besides IE, you will need a separate version of the Flash update in addition to the one for IE.

***The full version number only seems to appear in Add/Remove Programs, not in Help, About.

Beta versions not considered.

Keep the above programs up to date, along with your OS, and you are likelier to be a happy camper.