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Here's how to Fix Click-to-Run error (12) when installing Microsoft Office on Windows.

The Click-to-Run error (12) when installing Microsoft Office on Windows can be caused by a number of factors, including:

* Antivirus software blocking the installation
* A corrupted installation file
* A lack of administrator privileges
* A problem with the Windows registry

To troubleshoot this error, try the following steps:

1. Disable your antivirus software temporarily and try installing Office again.
2. Download the Office installation file again and try installing it.
3. Run the Office installer as an administrator.
4. Repair the Windows registry by following these steps:
* Open the Registry Editor by pressing `Windows`+`R` and typing `regedit`.
* Navigate to the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun
* Right-click the ClickToRun key and select "Permissions".
* In the "Permissions" dialog box, add "Administrators" to the list of users or groups with "Full Control" permission.
* Click "OK" to close the "Permissions" dialog box.
5. Restart your computer and try installing Office again.

If you are still unable to install Office after trying these steps, contact Microsoft support for help.

Here are some additional tips for troubleshooting Click-to-Run errors:

* Make sure that your computer meets the minimum system requirements for Office.
* Check for updates to your operating system and antivirus software.
* Try installing Office in Safe Mode.
* Create a new user account and try installing Office in that account.
* Restore your computer to a point before you started experiencing the error.