Also, since you changed from DSL to a different provider, I think your pc is recognizing its own IP twice. Something to that effect...
Do you have Vista
Service Pack Two? The service pack was supposed to solve this issue. (Windows update) Since you've been offline for quite awhile, I would suggest you download and install all the updates available.
Otherwise, there is a patch that was meant for this issue: (A vista specific problem, it appears).
http://support.microsoft.com/kb/948363
Follow the
View and request hotfix downloads at the top left of the page. (or use this link).
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