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New IE7 computer can't connection to some websites

I can't connect to SOME websites on a new windows 7 computer e.g. microsoft.com using either IE or Firefox - the computer connects via a network router/firewall and all other computers can connect without issue.  Any suggestions please?
1 Solution
Sounds like DNS issues on that box.

ipconfig /flushdns
Clear your browser history
Ashok DewanFreelancerCommented:
1st try to ping your gateway to check connectivity
Check DNS server entries. Type ncpa.cpl in command prompt. Open your local area adaptor and go to properties of tcp/ip v4 to check DNS servers and add the dns servers manually.
t38--Have you set up your HOSTS file to block access to certain sites?
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t38Author Commented:
Thanks for your responses - I'm going to check the computer later today (it's in a remote location) to see if any of your suggestions solve the problem.

jcimarron - No I don't have anything out of the ordinary in HOSTS.

Although I agree it's almost certainly DNS related I can't find anything untoward in my DNS config i.e. it matches other, working computers.  

The odd thing is I've discovered that a second Win7 computer has the same problem, they're the only two 7 boxes in that office, all XP computers work with the same settings...
t38--If it is a software problem it is likely to be IE9, which I assume you have on the Win 7 boxes but not the Win XP boxes.
IE9 has several security tools that could block access to certain sites, such as In Private Browsing,  Tracking Protection, and ActiveX Filtering (or even Popup Blocking).  See if turning those off one by one allows access.
Try eliminating the browser by trying another like Firefox.
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