iPhone 4S won't sync to Windows 7

Title says it all, iPhone won't show up in iTunes at all but my computer does detect that something was connected to the laptop. Phone is not jailbroken, my iPod will sync over the same usb cable. iPhone will sync to my friend's laptop. The iPhone will charge when I plug it into the wall.

iTunes is the most current version and I've uninstalled and installed every component of it twice.

The Geniuses at the Apple Store couldn't help me, any advice?

Thanks in advance!

 

Any tips or help would be much appreciated!!

 

No ideas at all?

 

Yes