The thing is, your setup was initially screwed a bit. You just didn't notice it coz it didn't matter that much with HDD. But for SSD, it's a huge bottleneck, if you are not running in AHCI mode. And the driver won't install exactly because controller was not in AHCI mode.
So, give it the last shot. Change SATA RAID/AHCI entry from Disabled to AHCI. Leave "Port 0-3 Native Mode" Disabled. I would switch "Onboard SATA/IDE" to Disabled if you are not planning to use it. You shouldn't really, unless you have so many drives and cd-roms that require extra sata ports.
Also, enable "HDD S.M.A.R.T. capability" under Advanced BIOS Features.
Since you had Windows installed in IDE mode before, you will most likely get BSOD after switching to AHCI. There is a way to fix it in Windows that won't force you to reinstall Windows after it, but it will require messing with registry. So it's easier to simply reinstall Windows once again.
After that you will get the best possible performace from your drives. Good luck!