I've had this happen twice now, different computers. Fortunately both were programs I didn't use that much. The latest is General Knowledge Base on Windows Vista. I opened it tonight and it comes up asking if I want to register this and the header now says UNREGISTERED. I know it was registered properly because I had used it multiple times, just not recently. (I haven't done anything that would cause it to become unregistered, such as trying to upgrade.) The first program I had a problem with was with Wondershare's Movie Story GAOTD (sic) Version on my Windows XP computer. I had never used that one, but when I opened it again a few weeks after installing, it said it was not registered.
Is anyone else had this problem?