Five-one-sixes happen all the time, they're in my logs (and lots of others have noticed this). A five-one-nine looks a bit more serious. I suggest Googling the Event ID to see what can be discovered.
Is`nt Mfehidk Part of Mcafee software??
It's a McAfee process.
Mfehidk.sys is a system process that runs in the computer background and maintains the Host Intrusion Detection System for McAfee Anti-virus. It is essentially a real-time shield and detects malicious software as it runs on the computer before it has a chance to cause significant damage.