I've tried updating my (Win7Pro x64) chipset drivers to either the 9.1.2.1007 from Gigabyte, or the 9.1.2.1008 WHQL from station-drivers. In either case, the installation appears to complete without error, but there is no message to reboot at the end. Even after I reboot anyway, the Device Manager still shows the original 9.1.1.1026 as the driver version for the various X58 system devices (e.g. the Intel 5520/5500/X58 I/O Hub to ESI Port - 3405).