The BT supplied disc I believe isn't necessary to install. It contains things like NetProtect, as far as I know, which I've read that it can cause more problems than good. All you should have to do is connect your devices to your hub, via ethernet or wireless.
Your connection speed of 5 megabits seems terrible, but without knowing what your IP profile is it's unlikely people can hazard any guesses. Also please tell us what BT estimated you would get prior to ordering.
To get your IP profile please complete the 'ADSL & Fibre to the Cabinet (FTTC) Diagnostics' at http://speedtester.bt.com/.
Bear in mind that you will need Java support on your web browser to run this test. Let us know the results
Last question of all, are you using any powerline ethernet plugs? Or just directly connected to the hub from PC via LAN cable?
Edited by Ixel (Thu 04-Oct-12 13:33:44)