Hello,
I have more of the same issues -- We had Hughes Net through a Lynksys wireless router - the desk top we have is on the ethernet cable and the 5 laptops are wireless. All computers except one wireless could access IE and browsse --the one laptop that could get on using IExplorer8 could access the internet using Firefox.
Yesterday we threw out Hughesnet and went with cable DSL (THANK GOD) except now we have two laptops that can't access the internet using IExplorer.