Missing mmcss service after rebooting pc

Hi,

System file corruption indeed is the leading cause of this types of concerns. But before we proceed to troubleshooting, we would just like to ask a few questions before we proceed to troubleshooting.

• If you receive an error message, what exactly is it and it what way do you receive this message?
• Was there any changes to the PC prior to this concern? Updates? Software installed? Hardware?

In the meantime here are some steps you may follow to troubleshoot the concern.

There is a lot of possible suspects for this misbehavior. A corrupted system file may result into a misrepresentation of the devices system displays. This could also be caused by incompatibilities with your hardware and drivers. Here are some steps we can follow to troubleshoot the concern.

Method 1: Troubleshooter

Have this diagnostic tools run first as a preliminary troubleshooting step:

• Find and fix problems with devices and hardware
• Find and fix problems playing sounds
• Find and fix problems recording sounds

Method 2: SFC/DISM

Please run the System File Checker tool as well to be able to detect and fix concerns with your entire system files. You may refer to this article: Use the System File Checker tool to repair missing or corrupted system files.

For DISM, you may follow these steps:

In command prompt, type the following commands and press Enter after each command:

DISM.exe /Online /Cleanup-image /Scanhealth

DISM.exe /Online /Cleanup-image /Restorehealth

Method 3: Reinstall audio drivers

1. To Uninstall a driver, please go to the Cortana search bar beside the Start button. Type devmgmt.msc. Hit Enter.
2. Expand Audio inputs and outputs. Look for your Audio device.
3. Right-click, then select Properties.
4. Navigate to Driver tab. then click Uninstall.
5. Restart the computer.

Hope this helps. If you have any other concerns, don't hesitate to come back to us.