Several days ago, my computer has developed a problem. At seemingly random times of day it will stop responding to key presses. It can sometimes take up to 5 seconds for the computer to respond to input when this is happening but I can move the mouse and click without trouble. It is not limited to specific applications and it even blocks shortcut keys such as
How can I find the cause of this problem? Could it be a running process that is blocking keyboard input?
Dell Precision LAPTOP, running Windows 7.