well firstly
1) the distro included in the August cd was Suse personal and not the ful prof. one
2) a live cd allows you to run and work on linux without installing itself onto the hard drive. As the name goes, it runs from the Cd
3) Emulators are generally software which emulate certain hardware so that you can run stuff running on that particular hardware, on ur PC
4) You can use aMSN, Gaim or Kopete messengers on any linux distros in order to use MSN
5) No, you don't need to install any a/v on linux. Till date there is no virus detected for any distro of linux. There are "worms" but these worms can't be classified as "viri". Also NAV won't run on linux. It works only under Windows