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Err, I can't remember this too well but before each windows OS spot on a hard drive it tells the computer that that's where the OS is so it can boot from it. I don't know about the software you used, but you probably transfered just all the files from one hard drive to the other, ignoring that spot on the original hard drive that says that's where it should go to when the computer boots up and looks for an OS to use.. ... so... Your new hard drive doesn't tell your computer that there is an OS on it so that's why you're getting that message.

I don't know how to solve this, but I think this is the cause of your problem.