Hey guys. a few months ago I installed Windows 8. It used to work properly but one day when I tried to shut it down, it didn't do that! The system was on for about 40 minutes and it hadn't been shut down yet! This problem kept occurring several times in that period (3-4 months). Of course there was another problem too. One day when I turned on the system, the Windows, loaded my profile and said "Please wait", I waited, but it doesn't show up the metro or even desktop! Why such problems happen? To get away from this, I migrated to Windows 7. But what do you think about the source of these problems?