|Since the problem happened after you installed Norton, I think the problem is Norton. |
What I think is happening is that the Firewall included with Norton is conflicting with the built in Windows Firewall. To fix this, go to Control Panel, double-click on "Windows Firewall" and make sure it is "Off". If it is not, turn it off and click "OK".
Report back if this fixes it.
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What to do now?