Next step: request a refund for the Windows licence fee. I did this many years ago for a "Windows Home Server" licence, it took a while but I did get a refund. I had to send in the licence stickers and other Windows-paraphernalia that came with the machine and did so gladly, I already had a "designed for Windows XP" sticker on the toilet lid and a "designed for Windows Vista" one for the garbage can so I did not need more of such. The refund was around €60, not insubstantial for a device I bought for around €350,-. As said this is many years ago but I assume there is still some form of Windows licence fee included with your purchase?