iTunes iPhone 3G no longer sees

Hello,
I have a problem with my iTunes, it no longer sees my iPhone 3G.
Heres what I did:
I uninstalled the Asus AI Load (manages the power of the USB ports when products Apple is connected).I deleted all the iTunes preferences (folder iTunes in Music).Depending on the Apple forums and the docs, so I put the DFU mode and I restored.I completely uninstalled components Apple and I have reinstalled (the last DLiTunes).
Nothing worked!
I am in Windows Pro 7 x64, x64 with iTunes + iPhone 3G 4.1.2.
My mac, it is well recognized. By cons when I plug in Win, my iTunes stopped responding, but such moves well and I recovered photos.
If you have any tracks would be cool because I like (finally) to synchronize my phone!
Thank you in advance and excuse my broken english
Bye
PC Windows 7 Win x64