Hello Nat prof,
Just to confirm that I understand your issue, please tell me which of the below summaries is correct:
You bought a Laptop that came with Vista Home Basic. You then installed Vista Home Premium and attemped to enter in the Vista Home Basic Product Key found on the sticker on the botton of the laptop. Vista Home Premium wouldn't accept the Vista Home Basic key and now you want to reinstall Vista Home Basic back on your Laptop?
or
You bought a Laptop that came with Vista Home Basic. You then Bought and Installed Vista Home Premium on the laptop and entered the Product Key that came with Vista Home Premium, but the key isn't working.
Thank you,
Darin Smith
WGA Forum Manager