Calm down guys.
I use G DATA IS 2009 and Windows Defender for active protection; and use Avira Premium (no start-up item, no resident protection, and the remaining service is set as manual), A-Squared Free (the service is set as manual), Malwarebytes Antimalware, Spybot S&D for on-demand scans. I run the update processes only when I do a scan, and scan my computer approximately once a month. For immunization I have Spyware Blaster. I think there has been no conflict on my system so far.
But David is also right, I think there are not any problems on my combination. If there is/are, say please.
By the way, I consider that using Ad-Aware is just waste of time and resources.