this is probably not the right place to post this but I have no idea how to fix it. basically, my old pc broke so I put the hard drive in to a pc I ordered off amazon, but now I have a small, semi-transparent message in the lower right corner of my screen that says "Activate Windows: go to settings to activate windows" so, I went to the activation setting and it said "We cant activate windows on this device because you don't have a valid digital license key". I tried changing the key to the one printed on my case but the product key didn't work.