You may see a warning about not being able to roll back to a previous version of Windows here. If so, click Next before continuing.

If you see the Windows logo appear before you press the F8 key, you’ll have to restart the computer and try again.

This process can take several hours, so just make sure that your Dell is plugged into an electrical outlet.

If you don’t have a Windows installation disc, you can make one by downloading the Windows 10 installation tool ISO from the Windows 10 installation page and then burning the ISO onto a DVD.

If your computer completely restarts without this prompt appearing, you’ll need to change your BIOS boot order.

If you don’t see a (C:) option, look for a drive with the largest amount of space on it.

If you don’t see a (C:) option, look for a drive with the largest amount of space on it.

You may be prompted to select a file system. If so, select NTFS and click OK. The reformatting process can take several hours, so just make sure that your computer is plugged into a power source.