How to undo the file sharing in your internal hard drive in Macbook?

I thought the way to lock and unlock a file would also be the same procedure when locking the internal hard drive?
Basically what happened is that I have an icon on my desktop (top-right corner) where I can access my applications, home, etc.
I thought I could privitize my whole entire system if I just change the file sharing into "Read Only (Drop Box)" status.
So I right-click on the icon, then clicked "Get Info," then clicked the lock button then it asked me for my password to be able to make changes.
My fault was I made the "Home" and "Admin" to "Read Only (Drop Box) status and "Other Users" to "No Access" file sharing.
Now in result I cannot click on anything. All the applications are lock. Even the System Preferences.
Another problem I came across is that I tried to turn my MacBook on...and it would just stay on the white screen with the apple logo and it would just load for ever.
So overall, my whole entire mac system is locked, can't open anything and I cannot turn on my Mac.
I tried calling the Apple call support services. But my warranty has expired. I could pay for it, but I really do want to save.
I hope someone can tell me a good solution. Next time I'll make sure not to do experiments anymore and stick to what I know.

You need to do it as soon as you turn the computer back on. If you have a firmware password set on the computer, you'll need to know it and have a Mac OS X install DVD; if you don't have either and a firmware password is set, contact Apple.
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