Can no longer access internet wired or wireless

I was downloading some Lenovo updates for an X61S and also ran scan wit
Norton Anti-virus 2008. Somewhere along the way I lost my interne
connections and the Diagnostic Policy Service is not running and denie
access (error 5). I think something has to do with the Norton A
firewall being activated and the windows being inactivated. I als
cannot activate the windows firewall. Lastly it shows an interne
connection with my Belkin router but whenever I try loading a browser i
shows no connection. It was working fine for several days before this.
I also rebooted to safe mode with networking and could not access still
I only have an administrator account on this laptop

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rpd2008