This ementes teaches you how to uninstall and reinstall the operating system on a computer running either Windows or Mac OS X. When this occurs, it is usually as a result of a corrupted or infected operating system. It is recommended that you back up your data to an external hard drive before re-imaging your computer.
Method 1 On Windows
1. Open Start. Click the Windows logo in the bottom-left corner of the screen.
2. Open Settings. Click the gear-shaped icon in the lower-left side of the Start window.
3. Click Update & Security. This icon is near the bottom of the Settings window.
4. Click the Recovery tab. It’s on the left side of the window.
5. Click Get started. You’ll find this option below the “Reset this PC” heading near the top of the page.
6. Click Remove everything when prompted. It’s at the top of the pop-up window.
7. Remove files from the computer’s hard drive by clicking on the Remove files button. When you choose this option, your computer’s hard drive will be completely erased, and Windows 10 will be installed on it.
An error message about not being able to roll back to a previous version of Windows may appear at this point. If this is the case, proceed by clicking Next.
8. Click Reset when prompted. Your computer will begin resetting itself.
9. Wait for Windows to complete the reset process. If you want to avoid your computer shutting down during the reset process, make sure it is plugged into a stable power source.
10. When prompted, select the Continue option. As soon as your computer has finished resetting, you will see this message at the top of the web page. By clicking on it, you will be taken to the setup page.
11. Follow the on-screen prompts to complete the process. To complete the Windows 10 reinstallation, you’ll need to choose a language, connect to a Wi-Fi network, and complete a number of other setup tasks.
Method 2 On Mac
1. Open the Apple menu. Click the Apple logo in the top-left corner of the screen. A drop-down menu will appear.
2. Click Restart…. It’s near the bottom of the drop-down menu.
3. Click Restart when prompted. Your Mac will begin to restart.
4. Place your Mac in recovery mode. Immediately after clicking Restart, press and hold the ⌘ Command key and the R key simultaneously until greeted by the “Utilities” window.
5. Select Disk Utility. It’s the grey hard drive-shaped icon in the main window.
6. Click Continue. This is in the bottom-right corner of the window.
7. Choose the hard drive that contains your Mac’s data. To access the hard drive on which your Mac’s operating system is installed, navigate to the left-hand side of the window.
8. Click Erase. It’s a tab at the top of the window. A pop-up window will appear.
9. Select “Format” from the drop-down box. Located on the right-hand side of the page, this option is available. A drop-down menu appears as a result of doing so.
10. Click Mac OS Extended. It’s in the drop-down menu.
11. Click Erase. This is in the bottom-right corner of the window.
12. Wait for the hard drive on your Mac to completely erase itself. Because the erasing process will take some time, make sure that your Mac is plugged in and charging to avoid it from accidentally shutting down during the process.
13. Click Done when prompted. Doing so completes the erasing process.
14. Click Disk Utility. This menu item is in the top-left side of the screen.
15. To exit Disk Utility, click the Quit button. Located at the bottom of the Disk Utility drop-down menu, this option is not visible. You will be taken back to the main Recovery window if you do so.
16. Select Reinstall macOS, then click Continue. MacOS Sierra will begin reinstalling itself on your hard drive.
17. Follow the on-screen prompts to complete the process. After MacOS Sierra has been reinstalled, you can proceed with the process of configuring your computer (e.g., choosing a language and connecting to Wi-Fi).
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