Question: how to delete ekrn.exe file?
Answer: Open Windows Explorer by pressing the Windows key and "E" at the same time. ... 
Go to "C:\Windows" and "C:\windows\system32folder," and delete all Ekrn.exe files.
Run a complete virus scan by opening your antivirus program and selecting "Scan All Local Drives."
Select "Delete or Clean Infected Files," and reboot.