"Ask for genuine Microsoft software" says the Windows Genuine Advantage prompt. Let's think about what will happen if you ask for genuine software. If you're asking a legitimate vendor, they will say yes, of course this software is a genuine, legitimate copy. If, on the other hand, you are asking an illegitimate vendor who is selling counterfeit copies of Windows, they will say yes, of course this software is a genuine, legitimate copy. Nobody, whether good or bad, is going to tell you that they are selling you a pirated copy of Windows under those circumstances, so telling your customers to "ask for genuine Microsoft software" is going to do exactly squat to prevent piracy and bootlegging.
Mokalus of Borg
PS - The only advantage to Windows Genuine Advantage is to Microsoft.
PPS - And software can't go from being "dangerous" to "safe" by entering a registration code.