My iPhone 4 won't update and the sound doesn't work, what should I do?

I have had my iPhone 4 for a few years now and recently started having some troubles. It hasn't been jailbroken and is currently at iOs 4.2.8--it hasn't connected to iTunes in over four months. The phone shows up in windows (I have a dell inspiron) so I saved all of my photos, but itunes can't find it so I'm worried that I will lose all of my music if I have to do a factory reset. I bought albums on iTunes a long time ago and they synced to my other itunes, but I don't have that computer anymore. Will I be able to get those back without having to pay again? Today my sound refused to work. It randomly comes on in a breaky, creaky sound.

Call Apple