MY Psp3000 wont let me see my pictures and videos whats wrong?

there in the correct file MP4 bitman jpeg ect. i have a folder for all of them music games video pictures ect.. I have no trouble using my usb to put them in the folder but when i exit out of my usb i go to my psp and go to picturees and video and it say video is not there or something what is wrong and the psp is... show more there in the correct file MP4 bitman jpeg ect. i have a folder for all of them music games video pictures ect.. I have no trouble using my usb to put them in the folder but when i exit out of my usb i go to my psp and go to picturees and video and it say video is not there or something what is wrong and the psp is brand new go it in christmas from my parents and is there any websites for download free Mp4 movies?
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