nero vision ...... help please

angie1

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i had already converted rmvb to mpg. i use nero 8 to burn  dvd. but why when3 L  g5 D3 k, q, W5 c
i add file , it came out a message like this : unabe to insert C:.............
; j! e. I4 K5 g) B) b( ?just cannot add, why ?
0 R3 C9 O3 x& c- H0 E% `# ocan someone help please 4 |- T# l( p+ R* |2 D& b
thank you