How to make an iso

ok you know how you can download movies off the internet that might play on windows movie maker or you can download torrents that have everything inside a folder? well i dont know how to turn whats inside those folders into iso images can anyone help me

ImgBurn, build mode.

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I will close this one, the other one will remain open:
http://club.cdfreaks.com/f34/movie-folders-isos-273753/