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I'd guess you'd have to do what Aaron is suggesting. Did you already try to remove the Client and do a re-install without rebooting first? It may have corrupted the client.
My recommendation is not remove all of them permanently - but simply to determine if there is a conflicting software. A step of determining that is simply to remove all of them and see if it works. If the behavior is the same - you would need to investigate
other options
