How to fix this: Access Denied to Installation Source – MS Office error

Are you unable to install Office due to the “Access to installation source denied” error on your Windows 10 PC? If so, then don’t go anywhere, as this tutorial will help you solve this problem easily and instantly.

When installing MS Office, you may encounter the “Access to installation source denied” error when installing on your PC. The main problem is the frequent occurrence of this error message, which causes the installer to crash to continue the process.

MS Office has Click To Run technology with an online installer. After the installer fails, you must restart the installation from scratch. In addition, there is no guarantee that the error will not occur again if you restart the installation. Therefore, you need to solve the problem first and then restart the installation.


What is the cause of the error “Access to the Office installation source is denied”?

What is the cause of the error "Access to the Office installation source is denied"?

Error 0x4004f00d is mainly caused by corrupt source files, missing DLL files and other system files, invalid or corrupt registry entries, system software, drivers and operating systems, etc. If your computer has recovered from a serious virus or malware attack, the same error is likely to occur.

If the “Access to installation source denied” error message appears, either the installation source or the directory where the installation is running is responsible. Make sure that your system is completely installed with the latest Windows update before you start troubleshooting. Then try these prepared solutions by Techquack to fix the Microsoft Office error.


To solve the problem of denial of access to the Office installation source

To solve the problem of denial of access to the Office installation source

Disable firewall malfunction

It turns out that this particular problem can also be caused by a set of redundant protections that block the connection between your local Office applications and external servers. In most cases, the connection is lost due to false alarms.

Several different third-party applications have been known to give false positives that lead to this problem. These include Komodo and McAfee. If you are using a third-party app that you suspect is responsible, you should disable the real-time protection and see if the problem persists.

Of course, the process varies depending on the security package you’re using — but in most cases, you can disable real-time protection right from the taskbar menu.

However, if you’re using a third-party tool that includes a firewall, the same security rules are likely to remain in place even if you disable real-time protection. In this case, the only viable solution is to whitelist desktop connections in your firewall settings (it depends on the security tool you use).

If your VA makes it difficult to create exceptions, you can choose a simple solution and delete it along with the remaining files (at least until you activate your license). If you need detailed instructions, follow the instructions below:

  1. Open the “Run” dialog box by pressing Windows + R. Then type “appwiz.cpl” and press “Enter” to open the “Programs and Features” menu.
  2. While in the “Programs and Features” menu, scroll through the list of installed applications and find the third-party security package you want to get rid of.
  3. When you see it, right-click on it and select Uninstall from the context menu. Once the uninstall window opens, follow the instructions on the screen to uninstall the third-party security package.
  4. Once the process is complete, restart your computer and check to see if the problem is resolved the next time you start your system.
  5. To make sure you uninstall the remaining files, follow this article (here) to make sure there are no remaining files that can still apply the same security rules.
  6. Try opening the Office application and filling it out again.

If the same error code 0x4004f00d is still displayed, go to the next method below.

Disable VPN / proxy interference

It turns out that office applications tend to crash when they have to work with proxy servers or private network connections established with VPN clients. Although they work, for the most part, they tend to produce errors when they need to perform sensitive tasks (such as checking license status).

If you are using a VPN client or proxy server, this is probably the reason why you received the activation error code 0x4004f00d. If this scenario applies, you can solve the problem by disabling the proxy server (or VPN client) before running the problematic Office application.

To help you, we have created two separate guides: One for proxy users and one for those who use a VPN client. Follow the instructions that apply to your specific scenario:

Disable Proxy Server

  1. Press the Windows + R keys to open the Run dialog box. Then type “ms-settings:network-proxy” in the text box and press Enter to open the Proxy tab of the Settings application.
  2. On the Proxy tab, scroll down to “Manual Proxy Configuration” and uncheck “Use a proxy server”.
  3. Then restart your computer and repeat the action that caused the activation error to see if the problem has now been corrected.

Uninstalling the VPN client

  1. Open the Run dialog box by pressing the Windows + R keys. Then type “appwiz.cpl” in the text box and press Enter to open the Programs and Features menu. When you see a prompt for User Account Control (UAC), click “Yes” to grant administrative privileges.
  2. While in the Programs and Features window, scroll through the list of installed applications and find the third-party VPN that you suspect is causing the problem. Once you see it, simply right-click it and choose Uninstall from the context menu.
  3. In the uninstall wizard, follow the on-screen instructions to complete the process. When the process completes, restart your computer and see if the problem is resolved the next time you start your system.

If this method did not apply or failed to fix activation error 0x4004f00d, proceed to the next possible solution below.

Deleting the MS Office

It turns out that this particular problem may also be related to some type of corruption in the Authority structure. It could be caused by an unexpected interruption to the machine or a failed update.

In this case, you can easily fix the problem by uninstalling the Office installation and running the “Fix It” tool, which is able to remove any remaining files that may be causing the same behavior.

Several concerned users have confirmed that by following this procedure, they were finally able to launch applications from the Office suite without an activation error. This confirms that the problem may well be caused by a corrupt Office installation that does not check the license key.


Frequently Asked Questions

  1. Disable the Windows firewall.
  2. Temporarily disable proxy server settings.

  1. Use the ordering hint.
  2. Start troubleshooting Windows 10 activation.
  3. Check the product key.
  4. Perform a clean installation of Windows.
  5. Restore Windows after a hardware change.

  1. Open the Office Word/Excel/PowerPoint. Click on the File menu, then Account.
  2. On the right, under Product Information, you will see the message Unlicensed/This product is not licensed and the option to activate the product if your office is not activated.

If the Microsoft Office you own is not licensed, you may get the "This copy of Microsoft Office is not activated" error. To fix this, all you have to do is pay to activate Microsoft Office and renew your license so that it works again without problems or errors.

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Mark Ginter is a tech blogger with a passion for all things gadgets and gizmos. A self-proclaimed "geek", Mark has been blogging about technology for over 15 years. His blog,, covers a wide range of topics including new product releases, industry news, and tips and tricks for getting the most out of your devices. If you're looking for someone who can keep you up-to-date with all the latest tech news and developments, then be sure to follow him over at Microsoft.