Help again lol

Ive proper done my comp now lol evertime i go to sign in yahoo mail or hotmail ect it goes to a can not find the page page..
Hotmail says its my proxy settings ??? anyone have any clues or help

Thanks ..
Sorry to be a prick about computers..

Which web browser are you using?

have you just installed a new firewall?

Heya thanks for replys i have just installed a new firewall but i have switched it off when tryin to sign in if that makes any diffrence .

turn it back on again, and when it sees a new programme wanting to connect to the net it should pop up in a little box asking to allow it to connect to the internet, click yes.

which firewall is it?