I'm a beginner with installing OS's and I've just upgraded from windows 7 ultimate to windows 8 pro. It booted up fine and then after about 5 minutes of browsing for drivers to install; it freezes and I can't move the mouse, type or even open task manager. Then I rebooted it and it happened again, this happened 3 more times and I did the same thing: restarted it and type in my username and password and start browsing and then it just freezes again and again. Please can someone help me with this problem! My pc specifications: CPU: AMD fx4100 3.6ghz quad core, 8gb RAM, AMD radeon HD 7850 2gddr5, 500gb HDD, 120gb HDD and windows 8 pro.