The hotfix that fixed it for me was KB976972. It was online for a while but then taken down again. I've just tried and its back again so there must have bene some glitch with it that they've since resolved again.

I would recommend that one.

Try this link for more information: You encounter problems when you move data over USB from a Windows 7 or Windows Server 2008 R2-based computer that has an NVIDIA USB EHCI chipset and at least 4GB of RAM.