If you don’t already know, all editions of Windows 7 discs ships with the same content. The only difference is determined by a configuration file which decides which edition your Windows 7 disc or ISO is. Knowing that, there is a tool out there to change your edition to any edition, or make it a universal ISO.
The Windows 7 ISO Image Edition Switcher is a set of small binary patches (and a tool to apply these patches) that will convert an official Windows 7 ISO disc image into an official Windows 7 ISO disc image of another edition.
The ei.cfg Removal Utility is a simple tool that will remove the
ei.cfgfrom any Windows 7 ISO disc image, thereby converting the image into a “universal disc” that will prompt the user to select an edition during setup.
For those system admins, this will be great for you. For those who tend to lose their disc or ISOs, you can now grab a friend’s copy and change the disc to the edition you want. But remember, this does not mean your CD key will work for any edition.