ok i really dont know much about codec i just know the types and that stuff..first part is what does everyone reccomend as the best codec pack or should i just install each one seperatly second im trying to split these videos and both wont go they are xvid vids..any ideas..please help

Did you check Guides section? There are few useful guides there. I suggest you to start with What Codecs Should I Use?

I'm sorry that no one had the courtesy to answer your question...

(I notice this question asked often but rarely answered)

It seems that the K-lite Mega codec Pack has every thing you could wish for, is updated often & does little damage.

Others may disagree... (now's your big chance guy's & gal's)