After a fresh install of windows 8.1 (old hard drive failed and replaced with brand new one) and inputting the product key, I land onto the desktop like normal but I get a notification that my key is invalid. Along with the hard drive change, I also decided to upgrade the gpu. I got the key from microsoft software swap and didn't have any problems activating the key the first time around. It's an 8.1 key and the installer I used was also 8.1. Any ideas?