Firefox can access HTTPS but not HTTP sites

Hi,
All of a sudden last Friday afternoon I could not load any sites external to our corporate network over HTTP in firefox; HTTPS still works fine. Also IE doesn't have any problems.
So far I've tried uninstalling and reinstalling, creating a new profile, disabling IPV6, disabling DNS prefetching and checking my firewall settings. I've also used wireshark to try and see what firefox is doing, but it seems that no traffic at all appears when an HTTP website is accessed, however accessing an HTTPS site does generate traffic.
We use Windows firewall with advanced security; I can't change much though because it is controlled by policy.
We also use McAfee for antivirus and Bluecoat for filtering; again I can't change anything here because they are either policy controlled or administered from elsewhere.
I think I can rule out Bluecoat as other PC's on our site can and still are using Firefox 4 to access the web.
Any help would be much appreciated.
Many thanks
Matthew Rose

Two different sites, one with .info and one with .net.  One works perfectly without issue and they each have similar settings in Server, however one only seems to want to work using https prefix.  The sites are both different and therefore needs to be accessed with http at this point.  The problem is when I go to http://example.info it takes me to http://example.net which is not what needs to be occuring.  This occurs internally and externally.  Before the move I did my server was doing DNS as well and those settings have not changed or been modified except when I had to change their outside static IPs.

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