Diagnostics Policy Service not running + wireless connection problem

I'm having problems connecting to wireless networks. When I try to run
Network Diagnostics and Repair, I see a message saying "The dependency
service or group failed to start", and then "Network Diagnostics canno
run
because the Diagnostics Policy Service is not running."

When I open Service Control Manager and try to start the servic
manually, I
get the message "Windows could not start the Diagnostic Policy Service
service on Local Computer. Error 5: Access denied."

When I try to connect to wireless networks, I can connect to th
network but
cannot access the internet.

I am the only user on the computer, and my account is an administato
account.

Any suggestions as to how I resolve this issu

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