Then there could be site blocking by a hosts file, an ad blocker, a pop up blocker, parental control, spybot immunization, real-time spyware blocking (like MS anti-spyware beta). That most likely would explain the error message.
Did you already try another browser like Firefox. If that works, it's a very useful workaround, and it somewhat restricts the area to look for the solution.
Can you ping the site?
I don't expect it's the router. But it's free to switch connections, of course.
I have a Dell 4550 on which my hard drive crashed and I had to replace/reinstall hooked up to a linksys befw11s4 router(firmware upgraded. I have site which when you get to it requires password etc. On other computers hooked to same router I can access site but the Dell with Win Xp reinstall/updated/sp2 will not load page. I keep getting a"page cannot be foud" hhtp 404.
Any suggestions would be appreciated.