Why can't I get on any webpage with a log in? new problem

in Genius Bar edited January 2014
Thanks in advance for any help, but I am at wits end. I have a macbookpro running 2.4 ghz and 10.5.1 and I have been using an AT&T Sierra Wireless 875U aircard with no problems. Today it will not allow me on any sites that have a login e.g. myspace,bank other sites like the sierra wireless page wont load they just hang.

I uninstalled the sierra watcher, reinstalled, no change. I erased all the cookies.

This problem is identical in safari and firefox.

I am not even sure if I will be able to log back in here to get help.

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