nero vision ...... help please

angie1

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3 G* R! b: D* p/ C/ U! ]2 [2 b, ^tvb now,tvbnow,bttvbi had already converted rmvb to mpg. i use nero 8 to burn  dvd. but why when
% _; ?: o* Z& {/ G: vtvb now,tvbnow,bttvbi add file , it came out a message like this : unabe to insert C:.............* ^+ }$ q. }& R4 o5 x7 y8 i. h
just cannot add, why ?
! W3 M" Z, L/ Y: s0 C2 gcan someone help please
7 N3 E% q4 S# V& ytvb now,tvbnow,bttvbthank you