Differences?

What is the difference between home and pro editions?

You can do a forum search about this. The question has been discussed a lot of times!
Here’s a link which can help you

http://avast.com/eng/av4_version_comp.html

but home and pro still scan for the same vrius is that correct??

Yes exactly, otherwise, there would be no purpose of installing Home Edition and I don’t think anyone would ever install such a thing. Pro version just gives you more options and some extra ways of configuring your settings and program behavior.