Media converter Problems :-(

The problem is the software, anything under 80mb its o.k to convert but anything over 100mb the sansa E250 (I’ve got european sansa player) player keeps telling me to convert using provided software arc software Please someone help me!!

What kind of files are you using?? (mp3? video format? pictures?)

Sorry video files I know that arc sotware convert everything to quick time files, my source video files are Avi,Mpeg2. As I said under 80mb ok but anything over 100mb it doesn’t convert