Sounds like a really bad hack. Sometimes the hack file can get corruptted and cause the same problems you're describing.
If you can't reformat the player, I would contact the seller. Where did you buy it from? If it was eBay, what's the sellers eBay ID?
To reformat your player the instructions are here:
http://mympxplayer.org/how-to-removi...ck-vt2400.html