I'm REALLY not trying to back up Sony here...
And 1 PC is 1 PC too many, but those numbers are ridiculous!
$1,000,000,000,000 / $25 = 40,000,000,000.
You really think *40 billion PCs* were affected to the point of having to be recovered for money by the fsking Sony root kit?
Now admittedly you mention secondary or tertiary costs, but even if we assume these unnamed costs run some $2,500 per instance, you still think 400,000,000 PCs? And that's assuming 400 million people (6-7 times the entire population of the UK) would somehow spend $2,500 removing a piece of software from their PCs. And this is going for the lowest possible trillion - you said trillion*s*, which is even more silly.
Sorry, just no - you're overestimated by many 100s of thousands of times. It MIGHT have cost a few million, at most, worldwide.
Still, it is officially "bang out of order" - not trying to defend it. Sony should have clearly paid dearly for such an arrogant action, and as far as I hear, did, to some degree at least. Let's not get too carried away with these figures though, eh?