530 Series SSD AHCI drivers?

I have installed 120 Gb 530 Series SSD into barebone system based on Celeron J1900 processor. But the system did not recognized it in AHCI mode, so I had to switch to IDE one to install Windows. My questions are:

1. Where I can get proper drivers (since J1900 doesn't support RST technology)?
2. Is there any way to make my SSD to work in AHCI mode now, after Windows (8.1 SL) is installed?