What Is The Easiest Way To Break A Bone

HELP! - Problems with Sony Vegas -

HELP!
Some pious soul who knows how to use Sony Vegas to tell me who knows if obscure reason I can see more video files compressed XVID when first, after you install the codec, I could see them perfectly? >_____\u0026lt;
A monument to those who can help me ç_ç
I tried various forums but I can not understand a chip only!