PC Perspective posted part 3 of their HTPC guide
Now that we've walked through installing all our hardware in our previous article, we’re ready to install our operating system and configure it to get the most out of Media Center. As I mentioned before, I originally was planning to do this build with Windows 8 Professional and the Windows 8 Media Center pack, but there’s a few things that Microsoft has removed from Media Center in the new version that make using it for a Media Center a non-starter in my opinion. Not being able to boot directly into Media Center and having to boot into Metro and then launch Media Center is a deal breaker for me so I fell back to what’s been working great for me these past few years, Windows 7 Home Premium.Cutting the Cord Part 3: Building your HTPC - OS Install and Tuning
Before we even start with our Operating System install, there are a few settings you are going to want to configure in your BIOS/UEFI for the best system performance and stability.
First, ensure that your Hard Drive/SATA controllers are in “AHCI Mode” as opposed to IDE or Legacy IDE. AHCI stands for “Advanced Host Controller Interface” and offers some features and performance improvements over the old IDE interface such as hot swapping of drives and NCQ (Native Command Queuing).