just paid and downloaded the full version of ewido…it said on their website…compatibility list…ewido can be used as a supplement for existing protection systems which avast! and the two others i have were on there…ad-aware se plus and spy sweeper…is toooo much tooooo much on the real time protection and wonder what the best way to do it…any suggestions??? 
In my opinion you should turn off ad aware se plus resident and spybot tea timer (resident) if used, and leave ewido resident only. If I’m not wrong it should not give any problems with any avast resident component. I’ve used spybot tea timer utill updated to MS defender. now it’s working as resident antispyware.
I’m using Ewido and Avast Pro together since 2 years and had never problems with.
don’t use tea timer…the ad-aware resident you’ll tallking about is ad-watch…i’ll leave spy sweeper and ewido running and turn off ad-watch…wonder what the ewido real time does…haven’t looked into it YET!!! ;D