SR-IOV is designed for Server OS's. Windows 7 is a client OS :-(
The only Windows VF Guest OS for which we currently have drivers for is Windows Server 2008, in both 32 and 64 bit. We are working on Virtual Function drivers for Windows Server 2008 R2, which should be available early 2011.
Any news on the release of a VF driver for 2008 R2 for this NIC?
The driver you need is included in the version 16.2 software release. I just got the web pack posted this morning.