This is from our IT guy here at work. Thought I'd pass it on:

"Its that time again.

There is a really nasty virus that gets on your PC through a unpatch java security hole.
These security holes have since been patched but its very very important to update your java here AND at home!

The virus is going around in bad doubleclick and google adds so they could pop up on virtually any website with adds (pretty much all of them)

Please update your java (or agree to update it when your computer reboots)"