New Laptop, iphone not syncing

I have a new laptop (Windows 7, intel i5, 4gb) and have installed the latest iTunes software.  I have an iPhone 3G.  The problem is that the iPhone does not seem to be recognised by the laptop.  It doesn't begin to charge when plugged in and it does not sync with iTunes.  The cable is working correctly when used with plug charger.  Any ideas?

USB ports are all functioning with no problems with other devices.
And the cable is working correctly too.
I have tried the troubleshooting but some of the options are not visible on my computer.
I have no idea what to do next.
I have reinstalled itunes and the associated drivers.  The phone still does not sync or begin to charge when connected.  Any more ideas?

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