ipod nano 3g from EBay does not see my downloaded itunes but my pc sees them when connected to the nano

I can connect the ipod, the pc recognizes it, can download my itunes and see them at a latter date, they are all mp3 files. The ipod knows that the right amount of merory was used (3.4 G) but does not see any music. When I got the ipod the menue was funnyI was able (I think) to do a reset only after one of the Utube videos suggested toggling the lock swith several times, thid in supposedly refurbished device.. Is there such a thing as downloading original software to the nano? Also, the itunes were on a 1g device. Could my itunes software on the pc be out of date for this device? If so, could that be fixed? My android (unfortunately trashed) had no trouble accepting the download and playing them. Thanks, Bob