My Mac did not restart after changing permissions of "everyone".

The reason of my question is because somehow and for a reason I now regret, yesterday I did a very foolish thing: I decided to change the permissions of my hard drive.
I have been in Mac just 2 months. I am the only User and Administrator of this Mac.
I changed the permission of "everyone" to "no access" believing that I was just limiting access to "everyone" except me. But after that I could not restart my Macbook Pro. It did not go beyond the Apple logo. Looks like I was also included in "everyone.
First I tryed to verify and repair permissions with Disk Utility restarting with Command+R. It did not work. I could not restart normally.
Then I figured it out that if I could only access that "permissions" windows again I could revert the process to "just read". Problem was how to access that window.
Lucky me, I had a 6 days old Time Machine backup in an external hard drive and another 6 days old Carbon Copy Image in a different hard drive. I restarted from this Clone Image with Command +R, opened Disk Utilities, opened the mount point of this Clone, (:/Volumes/Mac109Clone), right clicked Macintosh HD (the internal hard drive), got access to the Information Window and revert the permissions of "everyone" to just read. Then I could restart my Mac normally.
My 3 questions are:
The mount point to Macinthosh HD is "/"
The mount point to Mac109Clone (Carbon Copy image in external hard drive) is "Volumes/Mac109Clone.
1) Is this what shoud be?
2) What does "everyone" means in permissions: is everyone except me or everyone including me?
3) Why the "verify and repair" process did not work?
Thanks for the information.

mediclips --
You Mac already set up Permissions that would have protected you.
By applying settings that made sense to you, your Mac is now totally messed up.
Were you formerly a PC owner? If so, please read this article on switching to Macs:
http://www.apple.com/support/mac101/
1. If you have a password to login, you are already protected.
2. Do you have your "Security and Privacy" setting in your System Preferences set to Firewall "On?"
3. Stay away from non-Apple apps that promise "security," or "file cleaning." They are not needed, and cause damage.
Actually, I would recommend that you reinstall your OS, to get your permissions back in order. In the future, please know that your Mac knows much better than most users how to protect itself, and your information.
I just really hope you can successfully undo the damage you've accidently caused.
All the best!
EDIT: Others have had this "problem." But if the users had left permissions as they were originally set up, they would have no problem.

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