Loading Windows after using Knoppix CD

Hi, the boot disk I created after downloading the torrent was faulty I believe, when the computer starts the Knoppix icon appears, then the program stalls when trying to detect a CD drive (I believe). After reading about this, this seems to be a fault with the actual torrent file I downloaded. When I try to start Windows, the BIOS goes to a screen where it says there have been some hardware/software changes made and it now gives me the option to start Windows before a 30 second countdown.
Is this due to a change in the BIOS itself, if not, where has the change been made?
Thanks for your patience, I have no experience of running Linux and am trying to learn as much as I can as I go along.