I'm not here to push any AV or even Malwarebytes, but please tell me when was the last time your computer or any computer you manage hit with an actual VIRUS?

ZeroAccess is currently the most common Trojan infection and most AV products cannot fully or properly remove it own their own. One of the best tools as long as it's used under supervision of someone that knows how to use it and is used before other tools mess it up trying and failing to remove ZeroAccess is Combofix.

Please read the following posts (my screen name is AdvancedSetup) and perhaps that might give you a bit more to read on the subject.

Kaspersky missed some malware, I had to use Malwarebytes

MBAM Pro - what is scans

No conflict shown or proven
Is My NIS 2011 actually working?

Profile on Malwarebytes