Windows Version Numbers (english)

[DCB]

The simple version:
Windows 95 ---> 4.0
Windows 98 ---> 4.1
Windows NT 4.0 ---> NT 4.0
Windows ME ---> 4.9
Windows 2000 ---> NT 5.0
Windows XP ---> NT 5.1
Server 2003 ---> NT 5.2
Windows Vista ---> NT 6.0
Server 2008 ---> NT 6.0
Windows 7 ---> NT 6.1
Server 2008 R2 ---> NT 6.1
Windows 8 ---> NT 6.2
Windows RT ---> NT 6.2
Server 2012 ---> NT 6.2
Windows 8.1 ---> NT 6.3
Server 2012 R2 ---> NT 6.3
Windows 10 ---> NT 10.0

More details under:
http://www.gaijin.at/lstwinver.php
http://en.wikipedia.org/wiki/Windows_ve ... rogression

Check your Windows Version:
Start --> Run (or Win + R)
winver