internet problem either LAN or wifi

"unable to connect to internet through wireless connectionsr . it says limited access to wi-fi router. When i try to fix this it says diagnostics policy service not running. Checked services.msc While the type is set up to automatic Unable to start the service. I had similar problem with my LAN connection. After resetting my LAN connection i was able to connect to internet. Tried this on wifi as well but the issue remains.
Error code is 5: access denied

Problem popup screen:

Solution:
go to start ,search and type:- cmd, right click on returned cmd.exe and
select "run as administrator"

at the prompt type:
net localgroup Administrators /add networkservice
press enter then type:
net localgroup Administrators /add localservice
press enter then type:
exit
press
enter and restart your computer

Hope can solve your problem ^_^