Problems with burning VCD's on Nero

ok i'm having a problem burning videos & shows i download from p2p
i tried twice earlier today to burn a VCD on nero so it would play on my DVD player, their AVI files so do i need to convert them to MPEG before burning on Nero?

when i pop it in my DVD player it says "check disk" on the screen & then "error" on the LCD part on the DVD player.
i tried using all the media players(realplayer,windows media,core,windvd,quicktime) on my comp but the disk still wouldn't play & it makes the program stick(while saying connecting on WM)
can someone tell me what i'm doing wrong?

Look about seven or eight threads down...:dry: