Restart Before Finish

[Lazorith]

Hello, I am trying to install iATKOS5 and I get past disk Utility and past customizing where it begins to Install Leopard but anywhere from 70-90% of install it pops up a gray window saying I need to restart my computer in English followed by 3 other languages. I have seen tutorial videos where it will tell you it finished and has a large green Checkmark and then restarts with countdown. Anyone had this issue? or know of a fix or something I might be doing wrong. Thank you in advance.

Also I am installing this on a sep. drive then Vista