Decoding and Correcting Windows Error 0X8007021

Your computer has what’s known as an Access Control List (ACL). Its job is to tell Windows the resources, such as files and folders, users can access on your computer. If something corrupts the ACL, you can run into the “access control entry is corrupt” error when trying to access certain resources on Windows.

We’re going to show you how to get rid of the “access control entry is corrupt” error on your Windows computer.

1. Perform an SFC or CHKDSK Scan

Running an SFC scan can fix the error by fixing any corrupt system files associated with the proper functioning of the ACL. If the files are missing, a DISM scan will replace them using a cached Windows system image file. If these two scans don’t work, the problem could be related to hard disk errors, which you can fix with a CHKDSK scan.

The above-mentioned tools are built into Windows to help repair corrupt or damaged files , and you should familiarize yourself with how and when to use them.

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2. Close All Universal Windows Platform (UWP) Apps

Sometimes, UWP apps can lock resources when they’re running in their sand-boxed environment. They’re not supposed to, but when they do, you can get the “access control entry is corrupt” error message. To fix this, close the UWP app you suspect is the culprit and then update or reinstall it.

3. Change Ownership of the Affected File or Folder

Taking ownership of a file or folder can sometimes resolve the “access control entry is corrupt” error. To do that, follow the steps below:

1. Right-click the file or folder and select Properties.
   
2. Select the Security tab and then click on Advanced at the bottom to open the Advanced Securities window for the file.
   
3. Next to the Owner, check to see if your username is listed as the owner of the file or folder. If it isn’t, that may be the problem. So, click on the Change link next to it to open the Select User or Group window. Epubor Ultimate for Mac:Helps you read books anywhere, including the best eBook Converter + eBook DRM Removal functions.
4. Click Advanced to open the Select User or Group (Advanced) window.
   
5. Click Find Now to search for the available users on your Windows computer.
6. In the search results at the bottom, select your username and click OK. Jutoh Plus - Jutoh is an ebook creator for Epub, Kindle and more. It’s fast, runs on Windows, Mac, and Linux, comes with a cover design editor, and allows book variations to be created with alternate text, style sheets and cover designs. Jutoh Plus adds scripting so you can automate ebook import and creation operations. It also allows customisation of ebook HTML via templates and source code documents; and you can create Windows CHM and wxWidgets HTB help files.
7. Back in the Select User or Group window, click OK.
8. In the Advanced Securities window, click Apply and then OK.

Now that you’ve changed ownership, try accessing the file or folder again and see if the error still shows up.

4. Try Accessing the File or Folder From a Different User Account

Sometimes, the error pops up because your user account is corrupt, meaning that all the fixes above will most likely fail. What you can do is create another user account on Windows for troubleshooting purposes .

Try to access the file or folder (provided it is in a publicly available directory), and if the error doesn’t pop up, you can migrate the necessary files from the old account to the new one.

5. Restore the Access Control List

If none of the solutions above have worked, then it might be time to restore the ACL itself. To do that, first, back up your Windows 10 computer or back up your Windows 11 computer .

Then, factory reset your Windows PC , and that should get rid of the “access control entry is corrupt” error.

Access Every Resource on Your Windows Computer

The “access control entry is corrupt” error is frustrating since it locks you out of the resources you need at the time on your Windows computer. Hopefully, the first four fixes will help before you have to do something drastic like resetting your PC. Either way, it’s good to know you’re not stuck with the error indefinitely.

We’re going to show you how to get rid of the “access control entry is corrupt” error on your Windows computer.