MS-DOS 7 MS-DOS 7 MS-DOS 7 is a computer operating system which has never been released separately by its creator Microsoft, but which corresponds to the basic (real mode) of the Windows 9x family of operating systems. Windows 95 reports to be MS-DOS 7.0, while Windows 98 and Windows 98SE report as 7.1. A major difference between earlier versions of MS-DOS is the usage of the MSDOS.SYS file. In version 7 this is not a binary file, but a pure setting file. The older boot style, where Windows is not automatically started and the system boots into a DOS command shell, could
Windows NT startup process The installer can also be run from a MS-DOS command prompt so previous versions of Microsoft Windows that are already installed can be upgraded. To run the installer from a MS-DOS based operating system such as Windows 98 or Windows ME, the user must start the system "in DOS mode" and then execute I386/WINNT.EXE on the CD-ROM. A floppy disk containing MS-DOS can be used to start the installer. Versions of the installer in floppies were also available for sale. From Windows Vista onwards, the installer runs from BOOT.WIM which contains a bootable version of Windows PE. Windows PE 2.0