Its not easy to change ur ip u need to do it through ur isp which can take some while. They wont do it if u say "ive been banned of this website rah rah rah"
go to http://www.torrentspy.com or http://www.isohunt.com. Look for the file u want, download the .torrent fle open it in Azureus and watch it start downloading. And for a good p2p use bearshare. Google it
If u cant shutdown using start>shutdown try ctrl+alt+del and select shutdown from there. But try disabling norton and also scan for adaware and spyware.
If you have a bad computer dont leave it on for days on end. My [cabbage]box computer i left on for 40 hours the harddrive died and the cpu was on its last legs. So yer when your done with it at night just turn it off