Do you no longer have Firefox? Or have you just lost the top bar? If you do have Mozilla there is a button that looks like this: If you click on it, it should give you the option to show your bookmarks bar again. "View Bookmarks Toolbar". Was the update a Windows one or an AVG one, do you know? And when you say AVG has replaced Mozilla what precisely do you mean - as the are two separate programs that are for very different things. (You'll probably want to make a note of this before trying). With regard to your taskbar and Start going missing, press Ctrl Alt Del at the same time on your keyboard, click on 'Start Task Manager', then click on 'File' then 'New Task: Run', type in (in lower case) explorer and then click 'OK'. Let us know how you get on, Rob.