Remove Backdoor:win64/bedepA Virus

Infected with Backdoor:win64/bedepA

Backdoor:win64/bedepA has become a nasty computer infection which attack many user's computer:

I've had a quarantined item (Backdoor:win64/bedepA) being help in Microsoft Essentials. I have tried to delete it however the system won't allow it to be deleted. How do I remove this potentially damaging item from my computer??