Installed the new MB, etc. Gettin' a message in the lower right corner to "Activate Windows". When I check it out, we get a message that windows can't be activated because we don't have a valid digital license or product key. Tells us we should buy genuine Windows. Got any idea what this means? We had Windows 10 on it before I made the changes .... didn't change the hard drive. Will not activating Windows create any problems?