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Poppysanna's avatar
Poppysanna
Copper Contributor
Jun 08, 2026

What to do if High Windows CPU Usage?

My Windows computer is experiencing very high CPU usage that stays at 90 to 100 percent constantly even when I have no applications open. The system becomes sluggish and unresponsive and the fans...
KapilArya's avatar
KapilArya
MVP
Jun 09, 2026

Hello,

 

Suggest you to run System File Checker scan:

 

  1. Search for 'command prompt' using Windows Search.

 

  1. From results, right click on Command Prompt and select Run as administrator.

 

  1. Type sfc /scannow command and press Enter key.

 

  1. Let the command complete and then reboot the machine.

 

If issue still persists, perform clean boot:

 

https://support.microsoft.com/en-in/help/929135/how-to-perform-a-clean-boot-in-windows

 

Let us know if this helps!