nero vision ...... help please

angie1

* ?$ J" n2 J* o

! a' O9 d8 A) J7 O- e: d: e2 h" N公仔箱論壇i had already converted rmvb to mpg. i use nero 8 to burn  dvd. but why when
  N0 ^' _- }/ w" n* s. W! X8 s5.39.217.76i add file , it came out a message like this : unabe to insert C:.............
. `5 w  ?; I& o% D! I2 f+ d) x5.39.217.76just cannot add, why ?
! @9 |; R/ n/ _! \can someone help please
/ d& {0 L+ Q" Z+ I7 Y5.39.217.76thank you