Lots of people have attempted (and even made) anti virus software in VB, however I'm sure nobody will ever release a tutorial on doing so, because they're complex programs (by the look of it, complexity is often deceiving).
Anyways, I doubt NextGen (or anyone for that matter) has a tutorial on making an anti-virus in VB, other than the explanation he just provided. It's just too advanced to be written down or released Open-Source (in my opinion).