So I have Windows 10 on my old laptop and one day it just crashes. I fiddled with it for a few days and couldn't get it to work so I just wiped the hard drive. I have another copy of Windows 7 Professional and I used the disk to install the OS, however I did not want to use the product code because I need it for another system in the near future. Now, I get messages prompting me to input a product code and was wondering if someone from Windows could possibly help me with this issue. Thanks.