Yes, go through the second procedure ... modern malware often comes in various parts.
After scanning my shelves it looks like the earliest Heinlein book I have handy is
Methusaleh's Children, so I've been reading that for the past hour or so while I've been scanning my computer for viruses. This is the first book of Heinlein's I've read which had a future history diagram included in it, which is fascinating. I never cease to be impressed by not only Heinlein's technological innovations (for instance the self-driving car in this one) but also the nonchalant way he works it into the story without stopping the plot place to digress into the tech side of it. Lazarus Long is a cool character who reminds me somewhat of the hero in
Puppet Masters. The social conflict between the normal humans and the long-lived humans seems to foreshadow X-Men in many ways.
I think after I finish this I want to read Sixth Column if I can find a copy. I'm trying to read Heinelin's books in approximate chronological order as much as possible. Will need to find some of his early stuff I don't have, though--after this and Puppet Masters the next thing I have is Revolt in 2100. Is there a good Heinlein anthology with some of his early short stories/juveniles collected?