"Vista not running" error on LogonStudio Vista Intallation

I am currently running Windows Vista on my computer but everytime I have tried to redownload the installation application and run it for it to install, it keeps giving me an error saying that "Logon Vista requires Windows Vista to run" (but i am already using Vista), then I am forced to exit the installation. Basically I can't install the program because it is not able to recognize that I am running Vista. Can anyone help me fix my problem?