I'm going to comment on this troll post because it is such a textbook classic example of troll-ism.
The infestation attaches itself to an existing thread.
It pretends to be more knowledgeable than the previous posters.
It pretends to offer help.
The "help" is in fact sabotage.
In this example, at the very least one would make a fool of oneself and waste a lot of time. The troll would probably have an orgasm if the mark then posted asking for help.
In this example, at worst, the mark would need to get the original genuine install DVD and repair his OS.
Perhaps all these troll stories should have their own thread. Maybe we'd be the first on the block to do so.