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Now, you are required to press f10 to “Save and Exit”. Then you have to select “Yes” and then press “Enter” when prompted to exit saving changes. At last, simply follow the prompts in order to restart your computer. If the above-stated solutions do not help you to fix the problem, then you should try to reinstall the Windows Operating System. Moreover, you can also take help of our customer support service via HP Support Phone Number +1-877-645-7494. Here, you will get assistance and complete guidance under the supervision of skilled and experienced technicians.