The first thing to do when troubleshooting network/Internet related problems, especially problems involving security/privacy issues, is to make sure that your firewall software is completely disabled.
Since you said you had McAfee, I'd suggest that you go into the program's options, turn off the option to start the program automatically when Windows starts, and then reboot. Simply choosing "Disable" in McAfee's options once the program is already running doesn't usually shut down all of that program's components.
If you can log in to the site in question once McAfee is turned off, that's a pretty good indication that some preference/setting in McAfee needs to be adjusted.
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Wombat At Large
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