I'd try another PC. I've lost count of the times the USB ports on the front of the desktop don't work.
So, I got an Iphone 4 a few days ago and of courses I wanted to put some music on it. I installed itunes on my pc (Windows vista 32 Bit). I connected the Iphone to the pc, but itunes doesn't recognize it. I can charge it just fine and windows also recognizes it as a device.
I already looked into different forums and tried some things:
I reinstalled itunes and bonjour.
I checked that the Bonjour service is activated, as are the Ipod service and Apple Mobile Device.
When I check in itunes it tells me that Bonjour is supposedly not activated.
I also tried to shut down my firewall (zonealarm).
And I also restarted the Iphone and the computer, several times...
Another thing is that I cannot logon with my Apple-ID in itunes, I don't know if this has anything to do with this.
I really don't know what else I can try. I hope someone here can help me.
Please tell me, if you need more information from me.