(v1.0 for Windows)
(click Save, not Run)
1. Click Start and then right-click My Computer.
2. Click Properties. (or you can press the Windows logo key + Pause/Break key)
3. Look at the first line under System:. That's your version of Windows.
If your version of Windows is one of the following and your computer meets the other System Requirements (Microsoft .NET Framework 2.0 or higher installed) then you can install and run spacetornado Killer: