Thanks, yes do want to do a full reset of my account so I can once again use the Passwords option. I don't mind re-entering licenses etc just don't want to have to set up a whole new account and so lose them.
I have all my passwords backed up elsewhere ( not on this machine but not via Avast as never managed to get sync to work to allow passwords to work on more than one machine - have to re-enter passwords manually every time I buy a new machine) so not lost them as such, will just need to re-enter them into Avast once the programme lets me create a new master password.
So I will follow the instructions you give and fingers crossed once done I will be asked for a new Master Password and all will be well, just have to type in each password for it to be saved.
Well into the depths of this machine I go...........