This is usually caused by the bout.dat not existing (if you click start and nothing whatsoever happens).
Go to your BoutCheetah folder (I'm unsure if it's at C:\Zylon Gaming or C:\Program Files\BoutCheetah) and check for the file "bout.dat".
If it is not there, open the "version.txt" in wordpad and search for "bout.dat".
Change the number next to it to 0, and run the updater.