Accidently changed the "ownership & permissions" access admin setting to "read only"

In the "Get Info" window on my MacBook hard drive icon, I accidently changed the "ownership & permissions" access admin setting to "read only" & now it won't re-boot the operating system. Just displays the Apple logo & running wheel on a white screen . Any advice on how best to re-set/restore would be very much appreciated, thanks

This might help. Otherwise, it might be necessary to reinstall.
https://discussions.apple.com/docs/DOC-2240

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