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I have an external hard drive full of files that I attached to a new computer, and I followed some forum instructions to change the permissions (or maybe it was ownership) to "Everyone." It didn't work, because I can't copy/move the files to a new hard drive or run/play the files. I get a message saying that file access is denied, and I need permission from Everyone. I thought I already had done this! What course of action should I take next? Thanks.
Follow the below video. It's for Vista but the same steps are used for Windows 7 and I assume Windows 10.
If the video does not help then...
Do the following steps as shown in this blog. Substitute your external drive letter for E: in the below steps. On a large drive with a lot of files it will take awhile for the commands to complete. Do not interrupt the process. Each command completes when you see the prompt again.
The last version of Windows 10 uses Powershell. To get a command prompt do the following steps. After completion press the Windows key + X , command prompt as admin.
Open a Command Prompt with Run As Administrator.
Run this command: takeown /f e:\ /r
Right-Click on the root of the copied drive - the external drive
Click the Security tab.
Click the Edit button.
Select Authenticated Users.
Click the checkbox under Allow for Full Control.
Run this command: icacls e:\*.* /reset /t
Edit: It's hard to see the spaces in the above commands.