Hi ,
"Is there a way to restrict users from connecting to wireless networks that do not require a password (Public)."
Based on your description, are you trying to block users connect to some specific wireless networks?
This black list method is useful when you want to prevent users from connecting to some specific networks. Please check the following article for detailed information.
How to use Group Policy to black/white list wireless networks in Vista & Windows 7
http://www.grouppolicy.biz/2010/03/how-to-use-group-policy-to-blackwhite-list-wireless-networks-in-vista-windows-7/
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Best regards
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