HTTP Requests issue

Over the last couple days I've come across a strange issue.�  When I first turn on my machine and log in, I can not make http requests using any application on the computer.�  For example, http://www.microsoft.com results in the standard "request timed out/DNS error" page, as well local intranet pages.�  The weird thing is, I use HTTPS, FTP and other protocols (IM, local LAN access, Outlook, etc) with no issues.

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Now, the interesting part is if I connect to our SSL VPN system, everything works fine.�  I can even disconnect VPN and close the VPN software and everything still works fine.

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Anyone ever run into this?�  What would cause HTTP to become "disabled" ...