I'm having this problem, too. I updated to IE7 about a week ago, when IE7 downloaded updates, I was no longer able to view window pages, but could use both AIM and MySpace IM.
My computer shows a clear signal to my wireless router. I've even tried a hard wire straight to the modem. Still the same result.
I think it was a problem with one of the IE7 updates.
Something has messed with the programming inabling us to view internet pages.
I've tried loading another browser (firefox) and still the same result.
I've reset my browser settings.
I've turned off my firewall protection.
I've had my company IT guy give me all the basics.
This is clearly in the computer, not a connection or server problem.
Dell Inspiron 6400/E1505
running IE7
wireless and or ethernet DSL connection
Any help would be greatly appreciated...