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When you try to open a modern application with a local Windows account on Windows 10 or Windows 8.1, you sometimes get an error related to the UAC: This application cannot be enabled if the UAC is disabled or This application cannot be opened. The application cannot be opened if user account control is disabled.
This means that Windows cannot launch modern applications (metro) when the UAC is turned off.
How to repair this application can not be enabled if the UAC is disabled?
Changing UAC settings
To solve this problem, you must modify the Windows User Account Control (UAC) as follows:
1. Move the mouse pointer to the lower right corner of the screen to launch Charms.
2. click on the magnifying glass icon to start the search.
3. Type UAC in the search box, then click Change User Account Control.
4. Move the cursor to position 3 from below. Notify me only when applications are trying to make changes to my computer (default). These are the default settings for Windows. The system adjustment tools modify the system to never notify the condition, which causes the Explorer.EXE UAC error.
5. click OK, then restart your PC.
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Activate the UAC from the registry.
Press Windows + R to open the execution window.
Type Regedit in the Run window and search for the following registry.
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Current version\System guidelines
Check the EbableLUA value in the right pane.
Double-click on it and change the value data: 1
Enable UAC via group policy
The second way to activate UAC is to use the group policy. Open the console’s local group policy editor (gpedit.msc) and go to the section Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options. Enable the policy entitled User Account Control: Run all administrators in Admin approval mode.
Install the latest updates
Installing the latest updates for the Windows operating system is a safe way to solve many problems on your computer, and users have reported that installing the latest updates has solved the problem for many people. Try it out!
Open the PowerShell utility by right-clicking the Start button on the menu and clicking Windows PowerShell (Admin) in the context menu.
If you see the prompt instead of PowerShell at this point, you can also find it in the Start menu or in the search bar next to it. This time, right-click on the first result and select Run as administrator.
In the Powershell console, type “cmd” and be patient so that Powershell switches to the cmd type window which may seem more natural to users of the command prompt.
In the cmd console, type the command below, then click on Enter :
wuauclt.exe /updatenow
Let this command do its job for at least an hour and check that the updates have been found and installed without any problems. This method can be applied to all Windows operating systems, including Windows 10.
https://superuser.com/questions/725749/error-message-box-with-this-application-cant-be-activated-when-uac-is-disabled
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