You may have to
Link Removed of a particular file or folder to change some permissions.
Make sure that you consider both "Share Permissions" in the case of shared network resources, as well as NTFS permissions located under the security tab (local permissions/access rights). Whenever they combine the most restrictive prevails.
Please avoid the temptation to take ownership and or change permissions of system files and folders as well as "
Juntion Points" which may appear to be folders but are actually just
Link Removed - Invalid URL.