If you try to install Windows 7 on a Zotac BI323, you will find that you have to slipstream the xHCI drivers in the installation media before being able to access the hard drive and install the system. This is covered in an article by Zotac, and worked well for me. The utility provided
→ Read More: Windows 7 setup on Zotac BI323 hangs at “Completing Installation”