Hey, Due to the recent fails of Microsoft Security Essentials I have now switched back to avast free, Well I uninstalled it and reinstalled it, but then I noticed in my Windows 7 Action Center says this
No, Avast does not automatically disable Windows Defender.
Indeed, some people choose to run Defender along with Avast. [There is a big debate about this, not because of the potential for conflicts, but because many contend that Defender offers minimal, if any, protection above that which is already included in avast.]
Many people choose to run MalwareBytes AntiMalware, Paid version (in real time), along with Avast; while others choose to run SuperAntiSpyware, Paid (realtime) with Avast.
finally, some people are content with avast alone, running no additional anti-spyware program.
So you see, running an anti-spyware program with avast is purely a matter of user choice. Nothing is automatically disabled by avast.