I have been running Avast as my AV program and recently upgraded Windows 7 to SP1. I now find I am running Windows Defender anti-spyware and Avast at the same time. Usually running 2 programs is a no-no and can cause problems, so I was wondering if these are compatible or should I disable 1 of them. I have been satisfied with Avast and if the recommendation is to disable Windows Defender versus Avast, how do I do it?

Thanks