First time I ran off usb, it knew it was first time.
Second time, it remembered my previous settings (ie wireless name, password details, etc)
So first question - does it save these settings into the "overlay"?
What about
What do I do if I wanted to clear everything from start?

Secondly, I read somewhere that there is no need for antivirus, but is this true? surely my documents, files, settings, favourites, or anything else in the overlay are open to attack.

Also worse is that I have access to the C drive on the PC, so isnt it possible for any kind of malware to read and do things to and from c drive?

Anyway, I think knoppix is flipping BRILLIANT. Thanks.