Yes, isn’t necessary if you have a security software installed in your computer. In this case I have avast! Free 6.0, so MBAM is not necessary in this case. Or choose MBAM, without avast!, or whatever other security product(in realtime protection).

As you can see, I don’t believe in multi-layered protection software. Only one AV, one antispyware, one Firewall, one…Or better, an All-in-one security. In this case; AVAST or Comodo Internet Security. That’s all. Simply, that’s what I’ve learned.