My iPod touch 4th generation won't connect to iTunes. I have windows 8, and I have tried literally everything. I restarted my iPod touch, deleting and re-installed iTunes, plug in different cables, updated my iPod, etc. Help?

This has been happening for months and haven't been able to solve this problem. I want to reset my ipod touch but I haven't backed it up on my computer and I don't know how to do that when my iPod doesn't connect to iTunes. I also connected my iPod shuffle and it connected perfectly fine. My iPod is not jailbroken, I had this iPod for about two years now. I really don't know what is wrong with it. It shows up on my computer that it is connect but it won't connect to iTunes. Please help.