iPhone not showing in Windows Explorer

Hi,

My Environment is:
- iTunes v9.0.1
- iPhone 3G; OS v3.1
- Windows Vista

When I connect my iPhone to my PC, I do not see the device under Windows Explorer nor in Device Manager. However, iTunes does pick up the iPhone and I can sync ok.

I have tried the following -

I have gone to Device Manager and uninstalled "Apple Mobile Device USB Driver" from under "Universal Serial Bus Driver". I then disconnected the iPhone and reconnected, which then caused Windows to re-install the driver. However, it still does not appear under "Portal Devices" or "Imaging Devices" in Device Manager and it still does not appear under Windows Explorer.

I have also tried uninstalling iTunes and reinstalling, still no luck.

Any other suggestions?

Thanks