Macbook will not start after sharing and permissions error

I was cleaning around my files and went into the info of my Mac.
I clicked get info on the desktop icon and accidently messed up the sharing and permissions settings.
My computer would not let me into my Mac icon on my desktop, saying I didn't have certain permissions.
I tried restarting and now my Macbook will not startup. It turns on and loads, but never goes past that.
I removed the battery and placed it back in but it is not working still.
Thanks for the help guys!

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