THank you for posting your question.
What is the make and model of your computer?
can you press and hold down the windows key and press the pause break button. The system window should open up can you tab to the hardware tab and then tab to the device manager. Do you see anything listed with a red mark ?
You will need to start tapping the F8 key in order to get into safe mode. As soon as you restart the machine start tapping f8 even before you see anything on the screen.