Problem Copying Files to PSP

wen i copy files to my psp, it gets to about 60-80% then like the window closes on the computer and a please wait..... comes up on the psp! n says, ......

http://i17.tinypic.com/730i8nt.jpg

any ideas?

....my battery life was at 20%
PSP Slim
3.71 M33-2
have flashed a theme!
custom gameboot
have 908MB free
upload file size is 812MB

it seems 2 do it with evryfile i try 2 upload!

my only advice is to format the card a few times both in the pc and psp if possible.

i did try that, only did it once tho!

so u think maybe a few times would do it?

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Formated twice on PC and once after on psp to create the folders!

now Sorted, cheers Anonymous D! x