Does it matter if your copy of Windows is genuine? According to Microsoft, yes. If I understand correctly the gist of what they are saying, genuine Windows is less dangerous to its users.
It actually appears that the world is awash in counterfeit products. In Russia alone, 43,000 people die annually as a direct consequence of drinking counterfeit alcohol. Tragically enough, the fake beverages also cause losses estimated to $300 million!
And counterfeit cigarettes were reported to have "75% more tar, 28% more nicotine and about 63% more carbon monoxide" than genuine cigarettes in the UK market.
For Goodness sake, please make sure your smokes are genuine!
Oddly enough, I haven't heard of a genuine Apple computer yet.
And genuine Linux comes with ABSOLUTELY NO WARRANTY.