Up till now we have only focused on the Linux version. Our retail product will be based on Linux because, for the consumer, it behaves more like an "appliance" than a computer. Just like TiVo's and the other array of set top boxes built on Linux. However, we wrote everything from the ground up to be multi-platform so htpc users who want a Windows pc can use it too.
Starting with this 220.127.116.11 build we have the automated build/propagate process working for Windows too. And we have a new Windows installer that we will be releasing next Friday with the 18.104.22.168. I would suggest waiting 1 week for 22.214.171.124--the install program will solve all those issues by automatically installing MySql, php, and the dozens of required libraries, and pre-populating all the databases.