Windows 95 and 98 is based on the Windows 4.x Kernel. Windows 2000 and XP is baed on the NT Kernel. XP sports a different GUI compared to 95982000, this is the main difference between windows 2000/98 and XP.

Incremental: Windows 9x/Me/NT/2000/XP

Differential: Windows 98/NT/2000/XP

* Windows 1.0 * Windows 2.0 * Windows 2.1 * Windows 3.0, Windows 3.1, Windows 3.11, Windows 3.11 for Workgroups * Windows 95 * Windows 98 * Windows Millennium Edition * Windows NT 3.1, 3.5, 3.51 * Windows NT 4.0 * Windows 2000

* Windows XP * Windows Server 2003 * Windows XP x64 * Windows Fundamentals for Legacy PCs * Windows Vista I make that 17... but of course there are more... look up on http://www.answers.com/topic/windows-95-98-me-nt-2000-xp?cat=technology

List of released versions before XP on PC:

Windows Me

Windows 2000

Windows 98 Second Edition

Windows 98

Windows NT (rereleased)

Windows 95 (several)

Windows NT (several)

Windows 3.1

Windows 3.0

Windows 2 (several)

Windows 1 (several)

windows 95

windows 98

windows XP

windows NT

windows ME

windows vista

windows 7