I cannot connect my iphone 4 to my computer via the usb cable

Every time I connect my iphone 4 to my laptop to sync it all it does is give me a windows messagfe off the toolbar saying 'USB device not recognised' One of the usb devices attached to this computer has malfunctioned, and Windows does not recognise it. I've tried everything. Someone please help me.

http://support.apple.com/kb/TS1538

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