Where has my task list gone?

  golfpro 11:02 15 Mar 2007
Locked

When I tried to access my Thunderbird Email program today, I was confronted with a pop-up from Thunderbird telling me that I needed to download a security update. I tried to download this but it refused to install saying that I needed to close all applications and try again. This I did but it still would not install, and I could not get rid if the Pop-up, also when I tried to close down the PC altogether, it would not shut down. I tried to close it in the task list (Running programs) by ending Thunderbird when I did this the program installed, but took out most of my links in the task list. So where have the links gone and how can I get them back.
What's more important, why did this happen?

This thread is now locked and can not be replied to.

Elsewhere on IDG sites

Alienware 17 R4 2017 review

These brilliant Lego posters show just what children's imaginations are capable of

Mac power user tips and hidden tricks

Comment réinitialiser votre PC, ordinateur portable ou tablette Windows ?