Check Windows Version
Windows Version tells the exact Build of OS and service Pack you are using. You can simply check it by using Winver Command. Open Run Dialog box by using Win+R and type “Winver” there without quotes. This will bring a Windows which has OS details such as Windows details.
Alternatively you can also use the Command prompt to find the information. Type “Winver” in command prompt. It would display all details in command prompt.
Read more Tricks at Computer Tweaks and Tricks
P.S. Don‟t go by Screenshot details of this one. I am using Windows 7 Ultimate RTM @ my desktop and would be using the same once i fix up some issues with my Dell Studio.