The easiest way to do it is to reverse sync the songs from your mp3 player to your Window Media Player library. When you go into the Sync tab of WMP, it should give you this option to sync from your device. If not, then you can open up your mp3 player in My Computer, go into the internal storage, find your songs, and copy them. Then paste them into the folder where you normally store your music on your hard drive, generally the My Music folder by default. To add them to your library, in WMP, go into the Library tab, click the little arrow beneath the Library tab and select Add to Library from the menu. This will scan the folders you choose from music on your drive and add it to your WMP library. Hope that helps.