In this screen, you'll see each partition that Windows 7 recognizes.
The main difference in a Windows 7 clean install verses other kinds of Windows 7 installation methods is that a clean install involves the removal of all operating system related partitions.
Windows 7 setup considers partition management as an advanced task so you'll need to click the Drive options (advanced) link to make those options available.
In the next few steps you'll delete the partitions containing the operating system you're replacing with Windows 7, be it Windows Vista, Windows XP, a previous installation of Windows 7, etc.
