Not the I would presume to have an answer, but....no one is saying what other diagnostic steps they may have tried other than installing multiple browsers....after the second or third one, I would guess that perhaps it's not a browser problem, although I have seen plenty of issues caused by browser plug-ins and java applets. Please uninstall all third party firewalls, antivirus suites, internet security suites (not disable or turn-off but uninstall you can always reinstall them later) and turn off the windows firewall for diagnostic purposes. Double check your services console (from the run dialog box type services.msc) make sure that the "Bonjour Service" is not running if so stop it and set it to manual or disable, also make sure that there is not a service at the very top with a peculiar string of letters and or numbers and or characters, if that is running stop it and set it to manual or disable (this is actually the bonjour service in disguise installed by CS3 and some other apps). Please post back and let us know if this helps at all. The other posters in this thread are off line and I can't say if they found a solution or not. It's important to share your results so that everyone can learn....that's certainly why I'm here.