unrar problems

I seem to be having trouble creating the cdi file from the rars. I checked isonews and have the correct number of rar files that it says. When I open winrar and try to extract rar .001 it seems to start off alright extracting from each of the files, but then it seems to finish (100%) at file .016, when there are actually 26 files (msr). Then a error message appears saying, "CRC failed in extracting cdi". Can anybody help me?