Windows 10 Upgrade Assistant Stopped at 99%

One of my friend bough dell laptop recently which was running windows 8.1 that came pre-installed on this machine. However when he tried to upgrade it to windows 10, it stopped at 99% no matter how long he waited it to complete. so this is how we fixed this issue


windows 10 upgrade assistant stuck at 99


  • Uninstall Antivirus program (very important)
  • Restart your computer
  • Press Windows + R key , it will open run command window and there type ” services.msc “, as shown in image below.

run services.msc

  • On next screen it will show you a long list on services, you need to find windows update service. as shown in image below.

Windows update service

  • Right click on it and select properties then from drop down menu select disabled and apply. as shown in image below.

Windows update service disabled

  • Now start windows upgrade assistant and it should complete installation without any errors

Mutahhar Bashir

Passionate blogger, have excellent problem solving skills, quick learner, love to accomplish difficult tasks, improving my skills while helping others through this blog.

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