The three Types of windows 7 are:
XP, Vista, Windows 7
It 1952
The most commonly used versions of MS Windows are: Windows 3.1, Windows 95, Windows 98, Windows ME, Windows NT, Windows 2000, Windows XP, Vista, and soon - Windows 7!
You can use most versions of MS Word and MS Excel with Windows Vista. The versions mostly associated with Vista are MS Word 2007 and MS Excel 2007.
The modern versions will not work on DOS. The very early versions did, running through the windows environment before Windows became an operating system. These would be versions like Windows 3.1 or Windows 3.11 which you would have found on computers in the early 1990s.
MS-DOS
Pretty much yes, up until Windows XP there were versions of Windows that ran "on top" of MS-DOS, but XP (based on Windows NT) removed that requirement. MS-DOS sort of lives on as the Windows command prompt which supports most of the MS-DOS commands and allows people to run MS-DOS programs.
An example of a GUI is MS Windows as opposed to earlier versions of MS DOS which where character based.
Windows 3.1 would have been installed on top of a standalone version of MS-DOS. All standalone versions of MS-DOS used FAT12 or FAT16. It is possible to run Windows 3.1 on top of later versions of MS-DOS with a FAT32 file system, but this would have been extremely uncommon.
Windows 1.0Windows 2.0 (Windows/286 and Windows/386)Windows 3.0Windows 3.1Windows 3.11 for WorkgroupsWindows 95Windows 98Windows ME
Technically speaking, there is no MS-DOS 8. MS-DOS 6.22 was the last version of MS-DOS released as a separate product. Future updates to MS-DOS were bundled with Windows. You can create a basic MS-DOS boot disk that is branded as being "MS-DOS 8" by formatting a floppy with the Startup disk option in Windows Me, Windows XP, Windows Vista, and Windows 7. These are not typically considered "full" versions of MS-DOS, because they lack many of the programs conatined in 6.22 and prior.
It is impossible because Mac OS and MS Office for Windows work in a completely different way. Microsoft did actually release a special edition of Microsoft Office for MacOS, but I do not know if they have any recent versions or if they even support it any more.
Metal Slug versions include MS 1, MS 2, MS 3, MS 4, MS 5, and MS X.
Not all but most DOS software can run on Windows 98..