Rilee,
Read this :
http://www.mympxplayer.com/viewtopic.php?t=262
I think the only option, if you cannot return it to the seller, is to re-flash it w/ original firmware, which you may find on the CD that came w/ it. Look for a file w/ .bin extension on CD, then download the tools available on this site, and most importantly read all directions on this site. Please ask Admin for help.
Good luck, and back up FW first.
I