ALSO..... ALSO..... PLEASE READ
I wanted to SAY AGAIN:
That anyone who is not well-versed or confident, and/or comfortable with messing around with Motherboard Settings, etc., you should defer to an expert. Some of the changes that need to be made, must be done in the right order so as not to render your computer, um, useless! Changing to AHCI is an important step but must be done properly.
The link I provided does a good job of explaining the steps, but make sure you READ the ENTIRE POST, as well as UNDERSTAND the STEPS.