Mike,
This isn't the right forum but I will try and provide you with guidance. Please let me clairfy your question to ensure I understand corretly. Your main concern is having the ability for an Operating System to be tied against a mother board and/or system? You should purchase a retail version of the operating system which best fits the application you need. The following newsgroup can address Windows XP questions located here: http://www.microsoft.com/windowsxp/expertzone/newsgroups/reader.mspx?dg=microsoft.public.windowsxp.general&lang=en&cr=US
Also please review MS Market place and read about Windows Vista: http://www.windowsmarketplace.com/ .
Thank you,
Stephen Holm, MS