I recently installed Ps CC and Lr CC on a Windows 7 PC and since then Creative cloud and Core sync use up to 100% of CPU time even when no CC programs are running. This seems to be a common problem judging by the number of hits I get when googling the issue. The only solution I have found is to go into task manager as soon as the computer has finished booting up and cancelling the creative cloud process. Surely this sort of intervention should not be necessary. BTW I previously ran Lr 5 on this system with no problems.