An update after discussing this issue with Intel;
"...The Desktop Utilities Version 3.2 is meant for desktop models, and not for NUC.
The NUC is considered to be more of a mobile model, and input voltage of 1,74 V is perfectly normal...".
The Desktop Utilities still seems to be a great monitoring tool, which can be run in W7 environment (and not in "BIOS mode").
Yes, that's correct, in fact, your processor is working under specifications, see the following information where you can find operating voltage on page 90 table 43,
Intel(R) Desktop Utilities is not supported on the NUC products. You use it at your own risk. It has been found to work on the D34010WYB and D54250WYB boards but not on any others (either install will fail or application will not load).