I am having the same problem and am fairly sure it has something to do with the IP addresses and DNS server numbers that I've been playing around with on my home network. This problem exists on my desktop with Windows XP Pro and I only have IE 7 on it. It is directly plugged into my router. How does one find out what the DNS server numbers should be? Should they be the same as my laptop which surfs fine wirelessly with both IE7 and Firefox?