can i have some help

[master-t]

i put my memory stick data that was on the psp and stored it into the computer and when i put it on most of my data is missing. i converted my video and tryed to put it on the memory stick from the library from psp video 9 and nothin happened what should i do? i think someone should tell me what is inside each of their folder so i can see what is missin so i can look on my memory stick on my computer and see what is misin so i can have video again.