Dual-boot and avast! Free (1 or 2 places)

Avast Free Antivirus / Premium Security
1

I have, perhaps plans of doing this:
???
http://www.techspot.com/guides/143-dual-boot-windows7/

Have Windows7 with avast! Free on. Works fine.

If I installe XP on the same PC as second choice …
Can avst! Free controll both syntems: Windows7 + XP at the same time?

Or : Must avast! Free be on bout places = Windows7 + Windows XP ???

2

You need to install avast! twice - separately into each OS.