A genuine Vista software package has it's own unique key, however if you 'borrowed a copy' from another person or site, the key will not be valid on your machine, as I believe Microsoft uses the Vista ID and the Motherboard ID to verify you are the legal owner.
So you bought a laptop which didnt have Vista then bought an OEM copy of Vista and installed it on the laptop. OEM is supposed to be for system builders and if you have any problems then you get in touch with the system builder to sort it out.
I couldn't be bothered to read all of the "click here"
I have built two PCs for home and installed Vista OEM versions without problem. The motherboard on my Vista Ultimate failed, so had to be replaced. A quick phone call to Microsoft resulted in Vista being re-activated