Please give me a clue guys... My laptop with Windows 8.1 update 1 was activated with a MAK key, phone method (before update 1). No problems at all until i applied update 1. For the last couple of months my installation shows an erratic activation behavior. Many times when i turn it on, i see the "Windows 8.1 enterprise build 9600" watermark on the corner (although My Computer-Properties showed it's activated) , and a couple of times it prompted me to reactivate. Even My Computer-Properties showed i am NOT activated. Usually a reboot cycle fixes it. WTF???