Couple more ideas. Have you tried progressively switching off stuff, like the firewall, the anti virus etc. then connecting? Not ideal to be exposed, but if you can't connect anyway...
Also, you don't have windows & the router software both trying t manage the connection do you? It should be one or t'other. Lastly, have you tried disabling one & seeing how the other gets on? If that works ok, it would suggest a conflict when they're both enabled.