nero vision ...... help please

angie1

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; h3 v" u4 s' W* T- Ytvb now,tvbnow,bttvbi had already converted rmvb to mpg. i use nero 8 to burn  dvd. but why when
5 [- d: W/ Z! k; _9 ii add file , it came out a message like this : unabe to insert C:.............5.39.217.76$ i( E9 ^# [& G" l7 k
just cannot add, why ?tvb now,tvbnow,bttvb2 {9 N$ J/ y! L+ q: i) Q% u. V
can someone help please
  {$ l0 T5 P, L% O, j$ ~. T9 i5.39.217.76thank you