Firefox has just automatically installed the update on my PC
It's now v 3.6.13

I don't know when v 4 is due out, but it is in Beta testing stage.

Thank you Crispy and El Loro, I have now updated FF.
I got a message saying I should also update Adobe - should I click on that too? (Forgive me, I'm a computer thicko.)

Hi Yogi, it's safest to either wait for an Adobe product to be automatically updated or to check on the Adobe Updates site

Adobe Reader current version is 9.4.1 issued mid November. If you are stil using v 8, the most recent version is 8.2.4 released back in August.

If it is Flash, then visit here It looks as if v 10.1 is the most recent version.

Generally, these will automatically update, and it is known that there is a virus masquerading as an adobe update message.

Thank you El Loro, you have probably saved me from downloading the dodgy version.