Hi,
Welcome to Microsoft Community.
- When do you get this error message?
- Did you make any changes before you started getting the error message?
SentinelKeyW.DLL is a type of DLL file associated with Sentinel Keys developed by Windows Software Developer for the Windows Operating System.
For now I suggest you to refer Run DISM scan:
Type the following command in Run Window.
Type cmd in the search and right click on cmd from the search and click on Run as administrator
"Type the following command"
Dism.exe /online /cleanup-image /restorehealth.
Restart the computer.
regards,