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You're referring taking ownership of the folders again; haven't done that.<br />
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The problem is a specific user folder, that is: <b>C:\USERS\MAX_USER</b><br />
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A bit more info regarding our problem:<br />

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This folder owners is <b>MAX_USER</b>.
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Prior upgrading Windows 8 Pro to Window 10 Pro, we had 4 other user accessing all folders within <b>C:\USERS\MAX_USER</b>.
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After Windows 10 Pro upgrade, <b>MAX_USER </b>was the only user
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We proceed to add the other users and the error regarding this question started.
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Since doing a Take Ownership and then assign the users to the folder and then Windows will read all objects until the end (super long time), <i><b>What do you mean thru group policy?</b></i>
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We updated our W8pro to w10pro recently and just found that certain folders access rights has been deleted.<br />
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We proceeded to return adding users to their folders and after a while a series of &quot;<b><i>Error while applying security information</i></b>&quot; kept displaying displaying (see below). &nbsp;<br />
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<a href="https://filedb.experts-exchange.com/incoming/2015/12_w51/1056821/AccessProblem.jpg" target="_blank" title="err1 (20 KB)"><img alt="err1" class="file-block lazyload" style="max-width: 362px;" data-src="https://filedb.experts-exchange.com/incoming/2015/12_w51/1056821/AccessProblem.jpg" /></a><br />
We kept pressing &quot;<b><i>Continue</i></b>&quot; until it was too much and cancelled it; which gave us the message below.<br />
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<a href="https://filedb.experts-exchange.com/incoming/2015/12_w51/1056822/AccessProb2.jpg" target="_blank" title="err2 (29 KB)"><img alt="err2" class="file-block lazyload" style="max-width: 474px;" data-src="https://filedb.experts-exchange.com/incoming/2015/12_w51/1056822/AccessProb2.jpg" /></a><br />
Now certain folders, as displayed in messages, are &quot;access denied&quot;<br />
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How can we fix this?
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AccessProblem.jpg

AccessProb2.jpg

We updated our W8pro to w10pro recently and just found that certain folders access rights has been deleted.

We proceeded to return adding users to their folders and after a while a series of "Error while applying security information" kept displaying displaying (see below).  



We kept pressing "Continue" until it was too much and cancelled it; which gave us the message below.



Now certain folders, as displayed in messages, are "access denied"

How can we fix this?

Error while applying security information Windows 10

Operating system security (OS security) is the process of ensuring OS integrity, confidentiality and availability. OS security refers to specified steps or measures used to protect the OS from threats, viruses, worms, malware or remote hacker intrusions. OS security encompasses all preventive-control techniques, which safeguard any computer assets capable of being stolen, edited or deleted if OS security is compromised, including authentication, passwords and threats to systems and programs.

OS Security

Windows 10 is a personal computer operating system featuring the "universal application architecture" (UAP); apps can be designed to run across multiple devices with nearly identical code, including PCs, tablets, smartphones, embedded systems, Xbox One, Surface Hub and HoloLens. Windows 10 also includes a virtual desktop system, a window and desktop management feature called Task View, the Microsoft Edge web browser, support for fingerprint and face recognition login, voice-based search (Cortana), new security features for enterprise environments, and DirectX 12 and WDDM 2.0 to improve the operating system's graphics capabilities for games.

Windows 10

Network security consists of the policies adopted to prevent and monitor authorized access, misuse, modification, or denial of a computer network and network-accessible resources. Network security involves the authorization of access to data in a network, and covers a variety of computer networks; conducting transactions and communications among businesses, government agencies and individuals. Networks can be private, such as within a company, and others which might be open to public access.