Since the release of Windows XP, installing operating systems from a
CD or DVD (as opposed to a floppy diskette) has been common practice.
Some computers, like netbooks, however, don't have a disc drive, which
prevents users from upgrading or reinstalling the OS. With the release
of Windows 7, Microsoft enabled users to download the Windows 7 DVD as
an ISO archive file from the Microsoft Store. If your DVD drive isn't
working, or if your computer lacks a disc drive altogether, you can copy
the archive file to an external hard drive and install Windows 7
