Puffs-chan, If you had important files on the player you may be able to recover them with some sort of a file recovery program provided you do not write any new files to the player before trying. The other thing you should do is make a backup copy of your players firmware in case you have any problems with your player that require a re-install.
You can download the backup tool here:
http://www.mympxplayer.org/s1fwx-31-df417.html
And there is a guide to using it in the Knowledge Base here:
http://www.mympxplayer.org/how-to-ex...tool-vt66.html
If you get a chance it would be great if you could upload your firmware to site as it may also help someone having problems. You can upload it here:
http://www.mympxplayer.org/dload.php...load&cat_id=18
Try to include as much information on your player and the firmware version.