I am having a problem where the Windows 8 Metro screen freezes and the tiles do not update or can not activate them with the mouse. Using the shift key and restart I am able to set the computer to safe mode which will then boot and get to the Metro screen. I then go and uninstall the latest program or app that was installed and it will work fine after rebooting in normal mode. The it will happen again a day or so later. This is getting fustrating.