Cannot delete the songs on mp3

1. • 1 Connect your MP3 Player to your computer using the USB device cable included with the player.
     
   • 2 Click "Open Device to View Files" on the window that pops up when your device is connected, or double-click the device in the "My Computer" window.
     
   • 3 Select the files you want to delete by holding the "CTRL" key and selecting each one.
     
   • 4 Right-click the files you highlighted and select "Delete."
     
   • 5 Click "Yes" to finalize the deletion.
     
   • 6 Disconnect your device.
     

I do mine through Windows Media Player
1)Plug in Sansa
2)Open up Windows Media Player and wait for the Sansa e250 icon to show up under the library. First time, might say 'What device is this' or 'Autoplay'-for autoplay,you click 'sync media files to Sansa e250 using WIndows Media Player'
3)When library shows, click 'Sync' if it is not already there.
4)Just simply click and drag the songs you want from the computer library to the list pane on the side.
5)Once your done, click 'Sart sync'

TO DELETE
1)Plug in
2)Wait for the icon under Library in WIndows Media Player
3)Go to Songs under Sansa e250
4)Right click desired songs and choose Delete. You only want to delete from Sansa e250-nothing else

~loli~