Coby mp-705 2gb video mp3 player

Question

i am able to successfully load songs and pictures to my device but when using the conversion software to convert videos to then sync using windows media player to the device once it says its been added and i disconnect the device and try to view the movies on the player it says invalid file format its done this with more then one different movie and film clip and the files format are proper because i used the software the device came with to do the conversion any help is greatly appreciated also i noticed in the menu display their are two files there i did not add MTP.BIN and WMPInfo.xml do they belong on the device or are they whats stopping the video files from syncing properly should they be deleted and if so how do i do that ? please help me im going out of town for a week and this will be my only means of having movies and songs to enjoy