If you lose your Windows operating system, you can start your PC using Macrium Reflect rescue media on CD, DVD, or USB stick. This makes creating rescue media the first thing you need to do with Macrium Reflect. It contains a bootable, lightweight version of Windows and a full version of Macrium Reflect.
This lightweight version of Windows is called the Windows Recovery Environment (also known as Windows RE or WinRE) and is supplied with Windows 7 and later operating systems. For Windows XP, Vista and systems without WinRE, Reflect will download the Windows Pre-installation Environment (also known as Windows PE or WinPE) directly from Microsoft.