I don't see why the DSL connection would stop you from running scandisk, unless there was a program in the background getting information. I'd say close everything, and end-task on everything except for Explorer and Systray, and try it again.

"You need me. You wouldn't be much of a hero without a villain. And you do love being the hero, don't you. The cheering children, the swooning women, you love it so much, it's made you my most reliable accomplice." -- Lex Luthor to Superman, Question Authority, Justice League Unlimited