i know this question has been answered all over the internet, but i'm looking for easy instructions to resolve (been working too many hours and brain is not 100%) i accidentally set permissions in the Mac HD Info window for Everyone to "No Access". of course it locked up. i have an external drive plugged in running Time Machine. i understand i can use that to restore...? I ran disk utility - it failed because it could not locate the clip art folder in word (?wha?) repair disk permissions ran for 24 hours and couldn't complete. anyway - I know there is an easy solution here - i just want to be sure i'm doing it correctly so i dont make it worse than it already is... would some kind soul please provide me step-by-step instructions to either use Time Machine to repair - or something. big thanks!