How do i reset and erase the music files so i can download different music on it

Here are some steps you can try to resolve this issue:

Update your phone's software: Make sure your Nokia 301 is running the latest software version. You can check for updates by going to Menu > Settings > Phone > Device Updates .

Reset your phone: A hard reset may help resolve the issue. Before doing so, make sure to back up all your data as this will erase all data on your phone. To perform a hard reset, go to Menu > Settings > Restore Factory Settings .

Check the file format of the music files: Ensure that the music files you transferred from your smartphone are in a compatible format such as MP3, AAC, or WMA .

Try a different music player app: If the above steps do not work, try using a different music player app such as VLC or Winamp .

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 or erase the MP3 files using the USB cable that is connected to the computer.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 or delete the existing files using the USB cable connected to the computer.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

No just a reset will not cause files to be deleted. You will have to format the drive. See this tip posted here to help it is for a Sansa but it will help you understand. Sansa Mp3 player frozen? How to reset and...
Solve your MP3 Player Connection Problem.

If it's recognised by iTunes you can restore it.This erases everything and resets it back to factory presets.You can then rename it and put your music on without problems.Apple doesn't allow any form of file sharing but doesn't care how many different people use the same iPods.I have 3 -8GB iTouchs',3 -30GB iPods,1 shuffle and 1 nano.All from Pawn Shops,you can get them for 25 cents on the dollar.

I used Windows Media Player to erase the music data that I dropped using Real Player on DVM 5120.

You can reset the whole phone if you have already tried erasing it from its apps menu. Keep in mind that thid will erase everything (data, media, etc). I suggest you load all your media files to the MMC (mem. card), instead using the phone's mem.

To Reset:

menu Settings/Tools----Phone Settings---Security----enter user code--select Reset Default. Phone will off then on aftter 1 or 2 by itself.

Try this: disconnect the player from the computer, hold in the volume + button, and reconnect the player to the computer while holding the volume + button in. Keep holding the volume + button for an additional 5-50 seconds. Windows should eventually go into recovery mode and revive the player- it will pop up a window that says Found New Hardware Wizard.
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Download the Sansa Recovery Tool from the Sansa website.
Format - Erases Everything: Connect your Sansa player to the computer and open Windows Media Player. Click on the Sync tab. Pull down the drop down menu underneath the Sync tab by moving your cursor over the Sync tab and left clicking on the little black arrow underneath the Sync tab. Highlight "Sansa 1GB" (wording may vary slightly), and then select "Format." - this should erase everything.
Firmware Upgrade- Erases Everything: Get the latest firmware upgrade from Sansa - it updates the firmware and erases every song in the player all at once. Note: this method doesn't work if already have the latest firmware. Go to this website and click "Firmware Updater" to find out: http://www.sandisk.com/Retail/DriverDownloads.aspx
or
http://www.sandisk.com/DriverDownload/driverList.asp
-Tha Mp3 Doctor

you may have to reformat the MP3 player by clicking on the drive its listed under and right click and go to Format. Formatting is done with FAT, not NTFS. This will remove any games or other data on it too. Sometimes the reset thing might work. In general, anything you erase from it using a computer should erase off the MP3 player too.

Have you tried The Famous 5 Ipod R's? " 1. Reset your iPod, iPod nano, iPod mini( http://docs.info.apple.com/article.html?artnum=61705 ), or iPod shuffle ( http://docs.info.apple.com/article.html?artnum=300595 ). 2. Retry your iPod with a different USB or FireWire port on your computer (please note that the latest iPods can only be synced through USB). 3. Restart your computer, and make sure that you have the latest software updates installed. 4. Reinstall your iPod and iTunes software. You can download the latest versions of iPod Updater (http://www.apple.com/ipod/download/ ) and iTunes (http://www.apple.com/itunes/download/ ) from our website. 5. Restore your iPod using the latest iPod Updater. Important: Please note that restoring (http://docs.info.apple.com/article.html?artnum=60983 ) an iPod will erase all songs and files on your iPod and restore it back to its original settings. Make a backup of any files on your iPod before restoring it. After restoring, you can transfer your music and files from your computer back to your iPod again. Watch the Five Rs performance in action! (http://www.apple.com/support/ipod/tutorial/ip_gettingstarted_t16.html) " Did it help any? Good luck!