Thanks rdave Eddie and Warlord. I've done a system restore and the home screen has now reverted to its original state.....I've no idea what happened! Briefly, my address bar has always taken up about three quarters of the top of the screen and to the right of it was the search box which gave me direct access to Google etc. Yesterday the search box vanished and the address bar then occupied all of the top of the screen....search box gone! As I stated, system restore has brought it all back, but I'm baffled as to why it vanished in the first place. Can anyone tell me in case it happens again?