Restrict access to Windows C$ share

I need to restrict access to the C$ share on a computer.  For some unknown reason all domain users have Read access to the C$ share when only admins should be able to access this share.  How do I restrict this to only domain administrators?

skinneeJAsked:
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GKaloskyCommented:
Check you local administrators group.  Someone may have added domain users to this group.  Any member of the local administrators group on a machine will have access to all administrative shares.
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DmitriyCommented:
You need to apply correct permissions to the share.  Right-click on C drive, click on Properties. Go to Sharing tab and click on Permissions.  You will get the options to change share access.
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skinneeJAuthor Commented:
GKalosky, you were right that group was added to the local administrator group on the machine. This led me to check other computers and I found this is being applied on a domain level when new computers are configured.  Which means group policy will undo my changes.  Do you know where this setting is in group policy?
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GKaloskyCommented:
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