King of CaveMen first ,i think, you have to tell the difference between script kiddie and the real programmer - hacker,cracker,virus writer (whatever) which i hope you know. Then you should decribe the difference between the real virus that intrude your system by certain holes and not by an idiot or a defenceless person that download a file by luck (for the "virus writer") by a link without checking the source, but just running the file and then see the effect. The real virus should not let you use your PC "normally" even after a format of disk, that moment mention the blaster and sobig virus as a successfull examples.
I don't have much time so i end this post here, i hope i helped. I know i didn't, but after several months without posting i lost my form ;P.
Thanks for suffering me.