What I would do, and have done BOAC, is to kill that dial-up and do another. There are two ways. One is to dump it or to change the ID with an additional letter or digit. Then if you want to go back to your original setting - just dump and set up again.
Yet another check is Tools>Internet Options>Connections>Settings and check that all is OK. Also check that Lan Settings has unchecked boxes. To setup again or re-config you can use the CONNECTIONS page. Can't be certain but its worth a try.
PPP
