Windows Modules Installer Worker High CPU & Disk Usage in Windows 10

A frequently encountered issue with Windows 10/8/7 is the unexplained High Disk usage which at times freezes all other processes of the system. In a lot of cases, upon checking the Task Manager, it is found that the Windows Modules Installer Worker CPU and Disk Usage is very high  – at times even more than 50%!

The Windows Modules Installer Worker or WMIW or TiWorker.exe checks for new updates from the Windows server and installs them on your computer system. This process might cause load on the system and in some cases, push the disk usage to 100%, thus hanging or freezing all other processes. Restarting the system won’t work, and the issue does not resolve by itself.

Windows Modules Installer Worker High CPU or High Disk Usage

1] Before you begin, you need to check if your Windows is running the Scheduled Automatic Maintenance task and if it is, then give it some time – maybe hours, to finish. You will see its settings here – Control Panel > All Control Panel Items > Security and Maintenance > Automatic Maintenance.

2] The usage may also go high if Windows Update is running – so give it some time. If it is not running then run Windows Updates and see if any are available and install them.

3] You might want to also scan your computer for malware. So run an antivirus scan.

4] Having done this, the next thing you can try is to kill the TiWorker.exe process in the Task Manager itself and restart it and see if it helps. But it is quite likely that the problem will keep recurring. Thus, the concerned service has to be stopped.

5] Run the Windows Update Troubleshooter and see if it helps you.

6] Run the System File Checker and DISM Tool to replace corrupted system files and fix a corrupted system image.

7] If nothing helps, you may want to see if you want to disable automatic Windows Update. If you do decide to, open the Services Manager. This can be done by opening the Run box by pressing the Win+R keys and then running the command services.msc.

Now search for ‘Windows Modules Installer Worker‘ in the list. The list is in alphabetical order.Windows Modules Installer

Double click on Windows Modules Installer Worker and open the settings window. It is usually set to Automatic. Please change the mode to Manual.Windows Modules Installer Worker High CPU & Disk Usage in Windows 10

Now Search for ‘Windows Update‘ in the services.msc window. Double click on it and open the settings. Change the mode from Automatic to Manual just as in the previous case.Windows updates

If you are using Windows 8.1 or Windows 7, open the ‘Control Panel’ and click on ‘Windows Update’ and then on ‘Change settings’.Windows Updates properties

Change the setting to ‘Check for updates but let me choose whether to download and install them‘.

Windows 10 users may need to refer this post to disable Automatic Windows Update.

Reboot the system after completing the procedure above. The procedure above sets the ‘Windows Update’ to the Manual mode. Thus, it will not check for updates automatically and only when you command it to. This is a workaround till you are able to find the solution. Perhaps booting into Clean Boot State will help you troubleshoot the issue further. Do remember to check for and update your computer manually every week, in case you choose to follow the last suggestion.

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Anand Khanse is the Admin of, a 10-year Microsoft MVP Awardee in Windows (2006-16) & a Windows Insider MVP. Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.