Hi guys! I had to change the hard drive on my laptop due to a failure and after trying to install Windows 7, my product key doesnt work. Any ideas?

Where did you get the key you're using? Where did you get the DVD from? Was Windows 7 installed on the laptop when you bought? The key on the laptop will be for what ever version of Windows was installed on it when you bought it. How old is the laptop? Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. ”