Connemara-have you tried this? -
http://windowslivehelp.com/
You should be able to ask any questions there.
Windows also has Q&A forums - like this - where you may find a solution.
I'm not sure that your problem has anything to do with BT. In what way is your account blocked? Is it not recognising your password?
Here are some forum search results that I got by typing in 'cannot access windows live account' on the page I've just given you.
http://windowslivehel...dows%20Live%20account
You should also ask for help in the Technology topic here on AB.