Unable to Tether on iPhone 4

Hi everyone,
I have been trying desperately to tether with my iPhone 4. Tethering works when I pair my iPhone 4 with my desktop, but does not when I pair my phone with my laptop. I am trying to tether via USB (not Bluetooth).
I have tried reinstalling iTunes, and I have reinstalled the "Apple Mobile Ethernet Device Ethernet" driver which is giving me all the trouble. I have called Apple tech support, but the very kind patient customer service representative was also clueless.
Does anyone have any ideas that might help me?
Thanks,
chekmanirov

You cannot sync from one iPhone to another iPhone.
Is the iPhone 4 battery charged?
Plug in to Apple wall power adapter for 30 minutes.

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