When Windows 10 update hangs at 99 then you need to take an action. For this purpose, check out the list of possible solutions to resolve the issue. 

Methods to Resolve Update Hangs at 99 

• Disable Third-Party Antivirus 

When using Windows defender then some people are fond to use third-party antivirus solution. It is one of the reasonable choice for several reasons. On other hand, third-party anti malware tend to create a stir within system. Some people might block the upgrade process.

Now, we don’t advise to ditch third-party solution in favor of Windows Defender. However, users might disable the real-time protection for limited period of time until upgrading process install or even while removing it. It is advisable to try stable antivirus that don’t interfere with application on your computer.

• Temporarily Disable Internet Connection 

Several users can troubleshoot the issue by disabling the internet connection. For odd reasons, the network connection might negatively affect upgrading process. So, you need to try to unplug the Ethernet cable, or disable Wi-Fi and then check out for the changes with the updating process. It will be visible after connection is disabled.

If it is not the scenario then you can also restart the upgrading process, after downloading process completes.

• Restart Windows Update Service

Let’s check out the steps to smoothly restart your Windows update service smoothly:

• Type services in Windows search bar and then open services application.
• Now, scroll down till you reach Windows update service and then right-click on it and press stop. You need to repeat the action by clicking on start.

Another troubleshooting method is to restart your Windows update service. It will cover the update-related process by fixing Windows 10 update assistant not working issue.

• Clean System Reinstallation

• In Windows 10, you need to start by downloading media creation tool by following the link anchored and then plug the compatible USB flash driver. Here, if you lose the data then it is advisable to back it up.
• Now, run the media creation tool and accept all your license terms.
• Choose create installation media for another PC option.
• Select the language, edition, and architecture as per your preference and then tap to next.
• Choose USB flash drive option and tap to next.
• With this, media creation tool will start downloading setup and copy your installation file. Restart your computer after completing these steps. Press F10, F11, or F12 in initial boot screen to smoothly access boot menu. 
• Lastly, select USB flash drive as per the bootable device.

Summing Up

Check out the steps mentioned above to know about Windows 10 update hangs at 99. If you are dealing with any other issue like Windows 10 remove file association then you can check out the user manual to know details.