Here's the corrected list.
Windows 95 = 4.0
Windows 95OSR2 = 4.01
Windows 98 = 4.1
Windows 98SE = 4.11
Windows ME = 4.2
Windows 2000 = 5.0
Windows XP = 5.1
Windows Vista = 6.0
Windows 7 = 6.1
Windows 8 = 6.2
Windows 8.1 = 6.3
Windows 10 = 7.0 or 6.4??
more importantly, the major releases of windows:
Windows #1: 3.1
Windows #2: 95
Windows #3: 98
Windows #4: 2000
Windows #5: XP
Windows #6: Vista
Windows #7:7
Windows #8: 8
Windows #9: 10
this is the same stupid company that named xbox 3 "xbox one"