Support for Office products

Office Support Contact

Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

Microsoft Office 365/2021/2019 installation Error code 0xC004C008

This article describes an error code 0xC004C008. There are cases that have been discussed related to product activation and licensing-related issues due to the hardware changes. If more no of activation is being done using the same product key, it may cause Windows product activation issues.


Understanding Windows Error Code 0xc004c008

Applicable to the following Operating systems

  • Windows 11
  • Windows 8/8.1
  • Windows 10
  • Windows server 2008
  • Windows server 2012

Another code explained along with this above windows10/11 update error code is 0xC004B008. If the activation server denies the activation code entered, this could result in the above error code 0xC004C008. Common issues related to activation are an unauthorized key entry.


Troubleshooting steps to fix 0xC004C008

Basic troubleshooting start with the checking of system date and time. There could be network challenges due to Intermittent connectivity issues. If the time zone is set incorrectly, the system cannot be recognized by Microsoft servers. Make it your local time zone from where you are trying to activate Office or Windows.


In other words, the activation keys are blocked, try to take the assistance of a technician here. So that we can track the product keys on Microsoft Product code activation pages to verify the validity.

Clean temporary Files

  • Open Run (windows key + R KEY)
  • Type in %temp% and press enter key

temp files deletion

  • Select all (CTRL+A) and delete all files (SHIFT +DELETE )

Run SFC scan

  • Open command as administrator,
  • Type in  SFC/SCANNOW and press enter, then wait for its completion.

It will take some time to finish the scanning process , if it shows any errors in the results you need to do proper action suitable to the error.


The SFC/Scan Now command will scan all protected system files, and replace corrupted files with a cached copy that is located in a compressed folder at %WinDir%\System\dllcache.

The %WinDir% placeholder represents the Windows operating system folder. For example, C:\Windows.

Make sure no proxy behind your internet connection

Proxy connections are used to hide the original IP address from hackers. This internet protection mode is widely used by the company networks. 

The proxy server should be configured by the network admins to route the office server IP address. if not, the proxy should be temporarily disabled.

Clean booting of your computer

  • Open Run command window (windows key + R)
  • Type msconfig and press enter,
  • msconfig in run
  • Go to General Tab and choose “selective startup ” from the options
  • Uncheck “load startup items“,
  • Then Goto “services “tab from the top menu selection,
  • Tick on Hide all Microsoft Services and then click on Disable all tab
  • Click the Startup tab. Click on Open Task Manager.
  • Under the status bar, right-click each enabled startup item and select Disable and OK.
  • Now restart your computer, 

Repair your program or Operating systems

In windows 10 Resetting your computer is a simple task, Follow the step to repair your computer operating system.

  • Go to windows search bar left side bottom corner (Cortana search bar now)
  • Type in “Reset” you can directly find Setting for reset your PC
  • Then under the RESET PC, click on get started button to proceed.
  • There are two options to keep your files and complete clean. (You must take backup of your desktop files, pictures, downloads, documents before proceeding to complete clean.)
  • After reset, you may do updates cleanly without any issue. This resetting process takes time so please do it when you don’t have any urgent work with your computer.

Also, it is applicable to Microsoft Office and it’s versions. If the programs are provided to you by IT persons in your company, please recall the previous emails and check your product keys. In case if it is purchased for personal use, cross check if the programs are showing their validity under your Microsoft account.


At last, if you are still not able to resolve this issue Error Code 0xC004C008. I am sure they will help you resolve this issue. If you like to see the procedure for paid support, to clarify, you may ask the Tech Available online.

Take a support from Online experts regarding any unresolved issues on your computer.

Chat with our technician to fix your computer issues Now!

Chat with us for more Technical Support.

Scroll to Top