In this particular case, because I was hoping that the website could simulate the software program it is promoting that works through a series of information and control screens.
WHY do you NOT want to scroll down?
However in general, I think it is better not to scroll if you can get sufficient information into one screen. Or alternatively cut it into screen sized chunks as daniel suggested. My reason for saying this is that I think you will have a website with greater usability. Everything is visible and all the buttons are in exactly the same position.