Firstly I assume you had AHCI enabled in the bios before installing Windows 8.
So, just try installing the matrix driver in compatibility mode with Windows 7 or Vista : To install a driver/program in compatibility mode - right click the setup.exe file - click properties - click compatibility - check run in compatibility with windows 7 / vista etc. - check run as administrator - leave the rest blank. Start setup.exe and install.
If that doesn't work post back what controller is installed in device manager under IDE ATA/ATAPI Controllers.