New itunes software problem

So, I have my new Iphone 4 and when I connect it to my itunes, the itunes won't read it because my itunes is old version but in that old version of itunes i can download musics easily ( by simply dragging the song in the device) so i update my itunes with the new one and now the problem is the new itunes is very difficult to transfer music to my new iphone
it says that i ahve to erase and snyc my iphone but my new iphone is not really new its a secondhand but really works great so i don't mind, the problem is there are contents on my iphone that i don't want to erase like videos and games that not free anymore etc.
thats why i don't want to erase and sync it
even syncing will lost the contents of my iphone
i don't know how to download songs/transfer to my iphone w/o syncing.

Look here and see if the iTunes support can be of assistance

https://discussions.apple.com/...index.jspa

If not, then try opening a troubleshooting ticket here by clicking "Contact iTunes Store Support" link:

http://www.apple.com/...s/contact/

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