Hello Dmwilliams, thanks for contacting us through the Intel Communities.
I would need to inform you that this NUC only support AHCI and RAID sata mode. IDE is not included on it.
In addition to that, this product supports Windows 7, 8 and 8.1 only.
There are no drivers available for Windows XP. http://www.intel.com/support/motherboards/desktop/sb/CS-034034.htm
Please check on BIOS if the NUC is recognizing the mSATA.
Just a tip...
Install Windows 7 WITHOUT a key... wait for it to complete. Reboot, test, etc
Start the install again, put in your upgrade key. Enjoy not messing around with XP...
>> I am actually installing Windows XP so that I can upgrade to Windows 7 right on top of it with an ISO on a USB drive. I must do this because my 7 license key is for an upgrade key.<<
I was going to try the same workaround only with a W8 upgrade key but I had problems with XP.
I just did a clean install of W8 with no problems. I was not able to register my OS but Microsoft still provides me with updates. Working fine for three months now.
Side note: I am actually installing Windows XP so that I can upgrade to Windows 7 right on top of it with an ISO on a USB drive. I must do this because my 7 license key is for an upgrade key.
In this case, I follow the directions in the article below. Easy, and it works great!
If you need to download Win 7 with Service Pack 1...
Hope this helps,