Service host SysMain ensures 100% utilization - solved

 If you notice that your Windows PC is slow and now take a look into the Task Manager, you may see the "service host sysmain", which ensures 100% of the CPU load.

This process can be observed after rebooting and restarting the Windows system and can last several minutes.


If you want to solve the problem, we recommend that you perform the following two steps in sequence:

Step 1: Install updates

Make sure that the latest updates are installed on your Windows PC. To do this, navigate i the following submenu of the Windows system:

  • Settings --> Update and Security --> Windows Update

Now select "Check for Updates / Install Now".

The system will now check for the latest software updates.

Step 2: SFC/ ScanNow Repairing damaged components

1. press the keys:

  • Windows + X

2. the command prompt (Administrator) opens Now enter the following command:

  • sfc /scannow

3. confirm the command with the Enter key

Your Windows computer will now scan the file system and check for possibly damaged system files and repair them if necessary.

Step 3: Perform DISM inspection and repair

In the command prompt, which must be executed as administrator, please enter the following commands in order:

Command 1:

  • Dism /Online /Cleanup-Image /ScanHealth

Windows 10 checks the component memory for damage.

Command 2:

  • Dism /Online /Cleanup-Image /CheckHealth

The results are displayed for the scan that was previously detected.

Command 3:

  • Dism /Online /Cleanup-Image /RestoreHealth

This can be used to repair the detected errors.

Step 4: Uninstall antivirus software like Avira and CC Cleaner

Some antivirus programs or the CC Cleaner cause problems and can cause the "service host sysmain" to use 100% of its capacity. Therefore, you should uninstall these programs from your Windows 10 system as a test.

If this leads to an improvement, look for an alternative software.

These 4 steps should fix the problem with the 100% usage of the service host sysmain.


About the Author

Manuel Solvemix Team small

Manuel has been involved with technology for more than 15 years, especially with mobile phones, smartphones and PC systems and shares his passion here in this blog. If he can help someone with a technical problem, he is especially happy about it.