thomson television?

I own a thomson tv digital and since the change over i have lost a lot of channels as it will not do a complete re-install, I can't find the correct button on the remote to do this?
It has been used also with satelite tv (a while ago) which has been removed but it will not re-install or go back to the original digital settings since the change over please help as it is a very good tv?

colin
October 2009