I am not from Intel and I do not have that model NUC, but my guess is that there was an orange sheet of paper included with your NUC that mentioned having to go to downloadcenter.intel.com (the select Kits-NUC-model) for device drivers for hardware such as network. Whoever installed your Windows 8.1 probably neglected to perform that step (using some PC other than the NUC being installed).
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