Well, I guess I’ve been told off!

Para-Noid says “WD has been known to cause conflicts.” I’ve used it for years on XP and Win 7 with no conflicts with a variety of AVs, including avast!
As for his characterization of WD as “junk”, I disagree. His link to “bleeping computer” only emphasizes the problems when one uses 2 AVs in real-time, and does not apply to the question here, and does not support his opinion.

Para-Noid says “You are so wrong. WD has been known to cause conflict and false positives while running avast.” Once again I have to ask, are we talking about the same operating system here? With Win 8, I might agree. With Win 7, I would not.

Para-Noid says “Windows Defender … is useless.” I disagree, and challenge him to support this with any documentation other than his own opinion. See:
http://naut.homestead.com/files/Free/castner.html