Recently i installed windows 7 enterprise in my lenovo. Problem is that system became very slow.. Even for refresh, its taking 5-6 seconds. Sometimes pages are not responding, while i open multiple pages in my browser. From the last 5 days .. sometime, system is becoming blank, says intel graphics display drivers are not responding and has succesfully recovered. Can you please suggest me what to do?.. keep in my mind i am an unknown to computer. This is the first time im using.. please help.