You need Itunes, and you need your friends Itunes username and password if u ever want any of the stuff back on ur ipod
. To get rid of everything and start it out brand new just hit restore in itunes. To delete select music, videos, and apps if u have an ipod touch like me, go into the music or videos library, right click and delete. To remove apps you need to go to Ipod, apps tab, then uncheck the ones u dont want, and hit sync.
If the sync fails then u need ur friends user and pass. (Itunes store account) Go to authorize this computer from the store menu, type ur friends email and pass, then try again. To put music from limewire on it go to your Ipod touch music folder, and drag the .mp3 file into there. You will need to purchase the cover art, right click the song, get info, artwork, add, and add the artwork if u want it. Most songs u get arnt "Ipod ready" when purchase from the Internet.