This is a strage one. I have a very stable setup with MS XP at home with cable modem, linksys router with generic settings (no special filters, port setting, etc), and two computers. All has worked just fine for years. I have used the website Newegg.com often, but starting several months ago I cannot access the site with IE 7 from either computer. However, if I take my laptop to the office which uses the same ISP Newegg.com pops up just fine. No other web site is causing any problems.
The only thing that has changed is that I dumped Norton and went to NOD32 for my virus protection and started using the MS firewall. Both have default settings. I purged Norton using their removal tool, so that should not be the problem.