Kirk , unfortunately the software made for these players are Windows-based. You'll need a Windows emulator in your Mac to access these softwares, or simply use a Windows PC.
Next, try formatting the player with MP3 Utilities Disk Tool. The guide is here
http://www.mympxplayer.org/how-to-re...ck-vt2400.html
This should take care of the Trojans and as well as verifying the actual memory capacity.