Main SSD in the kid's rig died. Dead died. I swapped parts and now I'm re-installing Windows 10 from a DVD I have. I've got the product key that I used to register Windows 10 on the machine a few years ago. How screwed am I? Am I going to be able to re-use the product key or is Microsoft going to try and extract another $190 out of me for a new product key because the old one is forever tied to the hard drive that just went kaput?