First of all let me tell you that Windows 7 is not an supported OS for the S1200SPLR server board. You can check this on the following URL: https://www.intel.com/content/www/us/en/support/server-products/server-boards/000017643.html
Been said that there is a non official workaround that you can follow in order to get this OS version installed on that board. Follow the instructions described on this article: https://www.intel.com/content/www/us/en/support/server-products/server-boards/000022400.html
Hope this helps.
Thanks for your answer.
No more questions.