I downloaded and installed it from the Intel website, prior to that I had been updating the Intel Rapid Storage Technology Drivers from the MSI support page for my motherboard.
http://www.msi.com/support/mb/Z77AGD65.html#down-driver&Win7 64
I had installed version 11.5.4.1001 and then 12.8.0.1016, but they stopped updating them on the MSI website so I went straight to the source Intel.