Try running symantec RATTER- that was successful in getting rid of this things predecessor. http://www.symantec.com/business/support/index?page=content&id=TECH215519
More details please, what is it on pc, laptop, android tablet? What O/S are you using? What is classing it as a severe threat and what were you doing at the time?
I was playing a youtube video at the time and could understand why the vid wasnt play very well, and I looked at "performance" and it running at nearly 100%
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