usb device not recognised

Win7, latest iTunes, iPhone iOS 5.1.1

Not sure what's happened/changed but I plugged my iPhone into my PC tonight and opened iTunes. No iPhone shown. I look at the windows system tray and see a message sying the usb device was not recognised. I checked for driver updates and it said the correct driver was installed. Got the same problem looking in device manager.

When I checked for iTunes updates it said there was one so I clicked to download and nothing happened. Never seen this before but doubt the problems are related. I just went to apple and manually d/l and installed the latest iTunes.
Same problem. Any ideas?

I've cheked apple support and done what it suggests, latest iTunes, checked services running, rebooted, unplugged/plugged iPhone in, tried to update windows driver (it doesn't)

I've just plugged my iPad in and the exact same problem!
All other usb devices ok on my PC
LVL 29
QPRAsked:
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PradeepCommented:
Have u checked connecting your apple devices to another PC..?
Check whether the cable is working correctly or not.
U also have to  check for third-party software conflicts.
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QPRAuthor Commented:
Cable works perfectly for charging although I'm not sure that's a valid test?
Will try on my laptop. What sort of 3rd party software could cause windows to not recognise a USB device?
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PradeepCommented:
Check 6th section here
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QPRAuthor Commented:
I have no other phone/phone software.
That's the list I was referring to when I said I'd checked apple support
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mccrickCommented:
Uninstall all Apple SW and iTunes. Then reinstall. It would be smart to backup your iTunes library first, of course.
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QPRAuthor Commented:
Will give that a go but, to help me understand, why would windows claim an unknown device the moment I connect the iPhone even when iTunes is not open? Sounds like a hardware issue?
When plugging the iPhone into my work pc (prior to iTunes being installed) windows saw it as an external device without issue
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mccrickCommented:
The drivers are in play when iTunes is not open. It definitely sounds like software to me.

I have resolved some quirky problems with Apple iPhones by installing Apple's drivers and reinstalling latest versions.

A hardware problem with iPhone would typically cause problems and symptoms on multiple computers.
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QPRAuthor Commented:
Was a dodgy cable after all
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