SATA AHCI Controller

Last week I re-installed windows 7 and along with the hardware back to default everthing is ok.But my SATA ACHI Controller will not take a driver.I downloaded it,(the web can't find it or windows can't so I show it the driver .My computor went black shutdown,restarted the blue screen come up.Then it booted up and all all it is running really good.Thought you could help......thanks Scott