I have installed Windows 7 Pro SP1 on my 120GB SSD that's in my Compaq Presario C700 notebook computer due to the fact that the 60GB HDD I had installed didn't have enough storage and was failing. I got the OS to install, changed the time and date since it had linux installed, and it won't activate. It tells me the key exceeded the limit. Where can I find another product key to purchase (legally speaking)? Or should I clone the failing HDD to the SSD and see what happens?

Edit (1/22/18 @ 23:38 or 11:38pm EST): activated Windows with Microsoft's new activation site with the use of a smartphone.