Many times when you are asked about your installed Windows OS version details, the most common answer is Windows XP, Vista or Windows 7. People often only know that they run Windows OS, but not sure of the exact version details like build, version, service pack etc. CheckOsVer is a freeware tool which provides you with the complete version details of Windows your are currently running.
All you need is to run the portable tool and it displays the OS version including all details.
The Windows OS contains a set of components called the Windows Common Controls. These are the controls which give Windows its look and feel.
Different versions of the common controls support different features. Later versions of the common controls add more advanced features and in some cases, new controls. Some software requires a specific version of the common controls at a minimum in order to run correctly.
CheckOsVer will report which version of the Windows Common Controls are installed on your computer.