I am having problems playing back downloaded files.

Your player is incapable of playing back an MP3 file. Your computer has no problem . Newer players can play back those files along with the more conventional WAV files. Older cd units cannot paly back those files.

Get a free mp3 to Wav file converter and then do the burn.

MP3 players can only play music files in mp3 file format.You can download mp3 music files from the Internet toyour computer and then copy them to your MP3 player using the USB cable.For your CD collection, you need to convert your CDs tomp3 music files onto your computer or download them from the Internet and thencopy them to your MP3 player after you haveconnected the USB cable to the MP3 player and the computer.
You can do this using Windows Media player and Rip the CDs - Media Player willcreate a MP3 music file for each music track.Click on this link for instruction on converting musicfiles to mp3 file format :- http://www.fixya.com/support/r5798418-creating_transferring_mp3_music_files

MP3 players can only play music files in mp3 file format.You can download mp3 music files from the Internet toyour computer and then copy them to your MP3 player.For your CD collection, you need to convert your CDs tomp3 music files onto your computer or download them from the Internet and thencopy them to your MP3 player after you have connected the USB cable tothe MP3 player and the computer.
You can do this using Windows Media player and Rip the CDs - Media Player willcreate a MP3 music file for each music track.Click on this link for instruction on converting musicfiles to mp3 file format :- http://www.fixya.com/support/r5798418-creating_transferring_mp3_music_files

MP3 players can only play music files in mp3 file format. You can download mp3 music files from the Internet toyour computer and then copy them to your MP3 player. For your CD collection, you need to convert your CDs tomp3 music files onto your computer or download them from the Internet and thencopy them to your MP3 player.
You can do this using Windows Media player and Rip the CDs - Media Player willcreate a MP3 music file for each music track.
Click on this link for instruction on converting music files to mp3 file format:- http://www.fixya.com/support/r5798418-creating_transferring_mp3_music_files

This player cannot play mp4 files only mp3 files. When the files are copied to the MP3 player the computer can play the mp4 files from the MP3 player but when you play these mp4 files straight from the MP3 Go Gear it cannot see or play these files.

MP3 players can only play music files in mp3 file format. You can download mp3 music files from the Internet toyour computer and then copy them to your MP3 player. For your CD collection, you need to convert your CDs tomp3 music files onto your computer or download them from the Internet and thencopy them to your MP3 player.
You can do this using Windows Media player and Rip the CDs - Media Player willcreate a MP3 music file for each music track.
Click on this link for instruction on converting music files to mp3 file format:-
http://www.fixya.com/support/r5798418-creating_transferring_mp3_music_files

Sounds like your Nero ASPI file is corrupt download a new version HERE

Replace you original DLL with the one above and restart Nero ROM this should solve your problem.

copy right laws

no worries. there may be a read error. if it still connects to your computer fine download all of the files, movies, mp3, mp4 etc back onto your computer. once you have done this go into the file holding all of the mp3's and set the file to show details and look for a mp3 that is the incorrect file size... in general comparison to the other files. also if the device came with software look around for a restore factory settings button or wizard, and once the device is completely clear restart it and reload the files back onto it, remove the device (safely) then switch it off and back on and then try it out again. hope things work out bro.

try and format,you will loose saved tracks but should rectify problem.if this doesnt work search the web for firmware upgrades