Ipod problems

i buy a aplle nanao ipod recently exactly 1 week ago, i cant play movies in my ipod
i get the error messages like format error, the another problem is my ipod is 1 gb ,but icant play my favourites songs,because while i copy the files to my ipod above 110 mb icant play the songs iget the message "format error" my ipod is supporting only 110 mb.
but i have the capacity about 1 gb .please help me... my ipod support mp4 format but icant play that file also..."I TRY LOT OF METHODS, I DOWNLAOD I TUNES TO UPGRADE MY IPOD BUT ITUNES CANOT DETECT MY IPOD FORMAT IT REGULARLY ,SCAN FOR VIRUSES.
i need your help very Urgently. dont avoid my request i am waiting for your reply.....
RIAZ