regain control on security permissions on shared folders

Hi all,
I'd done something very stupid.  I changed the security permissions on several shared folders on the server to as follows:
Backup Operators --> Full Control
Everyone --> Read & Execute, List Folder Contents & Read
 
Now, I can't change the security permissions on those folders anymore, not even using account with administrator right (eg. administrator account).
 
How can I get back the control?
 
--
Thanks,
 
el
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