Windows 7 loses web connectivity, but nothing else

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http://serverfault.com – I'm having a really, really weird issue with one of the Windows 7 laptops in our office. When it connected to our office network (either by WiFi or cabled connection), everything except browsing the web works fine. It can receive emails via Exchange, initiate VPNs, copy files, connect to network resources, it can ping websites (like google, etc), nslookupis fine. But if you open up a web browser, forget about it. Everything just times out. If I connect the laptop to our guest network (which sits on an isolated vlan, but uses the same gateway as the office network), everything is fine (except (HowTos)