You can also use PowerISO to burn the modified DVD by clicking on the Burn toolbar button.
In the dialog that pops up, select the DVD Rom drive in which you inserted Windows 7 DVD. Start PowerISO, from the menu select Tools → Make CD/DVD Rom Image file.
Close down the installation dialog if it appears.
BURN ISO TO DVD WINDOWS 7 X64 HOW TO
This article discusses how to convert any Windows 7 single edition DVD into a Windows 7 DVD that can install any edition you want. But there is workaround that you can follow to change this. You are not given any choice of selecting which edition you want to install during the setup process. For example, if you have Windows 7 Professional DVD then it installs only Windows 7 Professional edition. There is a possibility that the Windows 7 DVD you received is locked or restricted to install only one edition of the Windows 7, like Starter edition, Home edition or Professional edition etc.