We're off on holiday and so someone has kindly put my husbands games for his PSP on to disc. I have a lexar memory stick PRO Duo 8GB Magicgate. I thought all I had to do was copy the file from the disc to the card on my PC, but although it shows on the PC as being copied, when we put it in the PSP it says there are no games. What are we doing wrong? We're not very technically minded so any help will be much appreciated.