I live in China and recently purchased an Acer laptop from an authorised seller. Problem was it had a Chinese Vista home premium O.S. installed. So the seller promised to re-install with English version. This turned out to be Vista Home Basic which a couple of days ago gave me a message that I had a duplicate product key and had to obtain another. The laptop is fine and I have an authentic product key for Vista home premium which when I type in obviously informs that it's for premium and not basic so it doesn't work.
Is there anyone that knows anywhere where I can download a trusted Vista premium O.S. as I've heard any copy would be good with an authentic product key?
P.S. The seller is useless so it would be futile going back to them!