How do you remove folders from the PS3 game directory?

[chip75]

Hi guys, my sister has been using my PS3 for the last few weeks to play Final Fantasy but the other day when I went to download a demo I noticed she'd moved all my demos and downloaded games into different folders without asking.

I know you can un-sort them with the SQUARE button but I'd like to remove the folders and place them back in their original order. Is there a way to do this? And is it possible to sort them by name? I can't find that option.

Also before she started using the PS3 I had over a hundred demos on the HDD now there's 36, so I'm not sure where they've gone! It's possible I deleted them myself but I'm sure there were more than a 100 and not just 36!