rayzet, it's a fixed version of Vista. (The version number you get in "cmd" and "ver" are 6.1, Vista was 6.0)

4.0 = Windows NT 4.0 Server and Client
5.0 = Windows 2000 Server and Client
5.1 = Windows XP
6.0 = Windows 2008 server and Vista.
6.1 = Windows 7