I was running 8.04.2 LTS on my Dell Inspiron 910 net book. On September 05, 2010 I ran the updater and got a large update for the system. Immediately thereafter the computer froze. I disconnected the battery, waited and rebooted.

Now, when I go to launch Firefox (which is now only identified as "A Web Browser") I am prompted: "Could not Launch Application - not a launchable item"

What can I do?