Ok so I've never used linux in any form. My whole family is made up opf programers who do however so when I ran into a little virus problem and they recomended using Knoppix as a dvd/cd boot. (Yes I did the whole safemode and so on type stuff but this thing won't let me get rid of it)

So here's the deal. I've downloaded the iso and burned it, and knoppix boots up but says it can't find a knoppix file system and gives me the limited shell. My brother was going to walk me through fixing my computer over the phone, but was confussed when knoppix didn't fully boot up. I know I shouldn't have to install anything to make it work so I'm wondering did I burn the dvd wrong? What should I do?

My goal is:
I need to go into my windows directory and change the name of or just plain delete the files running the virus. I know which ones and where they are, but with them always running I can't get rid of them.
I would just use a dos boot if I had one, but its a laptop and so there's no floppy drive. If someone could help me get Knoppix either completely running or could even point me to a cd/dvd dos boot disk I'd be ever so greatfull.