There may come a time when you need to reformat your computer’s Windows 7 operating system, but you don’t have your original installation CD. Reformatting wipes all of your data and reinstalls the operating system, so it’s important to have a backup of your important files before you begin. If you don’t have your original CD, you can still reformat your computer without it.

The first step is to download the Windows 7 ISO file from Microsoft’s website. This is the file that contains the operating system’s software, and you’ll need it to reformat your computer. Once you have the …