My iphone won't sync to itunes? - 2

I have an iphone 4. I got my computer in january, and i've never had any problems with itunes. Its always automatically synced to my iphone, but for some reason, a week ago, it just stopped. My iphone doesn't even show up as a device in my itunes. It says its backed up under the "devices" tab, but it usually will show up on the left side and say "my iphone" and i can click on it and change the syncing options.however, i never changed anything. My phone still charges with the charge port, it just won't sync. Can someone help?

You might have an iTunes update… Or your pc can't recognize your phone… Try going to- start/computer/portable device/ if you don't see, 'portable device', then, the problem is your phone or computer(make sure its plugged in the pc).

You could try re downloading iTunes*** (BEST CHANCE)