Hi there! My name is***** am a computer professional with over 15 years of experience with both Mac and Windows computers, phones, tablets, and printers. It would be my pleasure to assist you with this. There are several ways that we can go about this. One is to use the built-in factory restore utility that some computers have, that will reset it to "out of the box" condition. Can you tell me please the brand and model of your computer?