I'm afraid I'm a bit of a technophobe Sveta, so any solution will need to be idiotproof. I tried to install a package from BT and couldn't because I got a message to say that I wasn't connected to the internet. When I checked, it shows that I am connected via network 2, but broadband is NOT CONNECTED, and this message appeared. Error 651. The modem (or other connecting device) has reported an error.
It is having a limited effect on my use. I can still use e-mail, facebook etc, but can't install programmes or video chat on Facebook as my camera appears to be disconnected. Also, my phone has no internet connection.