I consistently had this problem over the last year. I eventually switched to an android phone so I didn't have to deal w/ itunes anymore. However, my wife just got me an ipad so now I'm back to this issue again. There was a procedure I used to do to remedy this and after searching for a half an hour, I haven't found it, but it jogged my memory enough to muddle through it.
This procedure is if Apple Mobile Device Driver doesn't show up in Device Manager and your Apple device does not show up in itunes, but does show up in devices and printers.
For windows 7:
- open devices and printers.
- Right mouse click Ipad (or iphone) icon and select properties.
- Select properties on the hardware tab.
- Select change settings.
- Select driver tab and click on update driver.
- Select browse my computer.
- Click browse button and find C:\Program Files\Common Files\Apple\Mobile Device Support folder.
- Click next and it'll install the Apple Mobile Device USB Driver.
After this, it should show up in itunes. Unfortunately, I have to do this every time I want to sync to itunes. Hopefully, this save someone else my grief.