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Have you try running your antivirus to make sure your system is not infected?
Try with a BIOS recovery; you can download the latest BIOS version here:
BIOS Update [WYLPT10H.86A]
Please check BIOS Recovery Update Instructions for Intel® NUC
You can also, try third party software to recover files from corrupted folders.
NOTE: This link is being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.
The easiest and safest repair of Windows 10 is with an In-place Upgrade. Nothing will be removed and your installation will be upgraded to the latest version of Windows 10. It can be done using Microsoft Media Creation Tool. It must be done from within Windows. Here you will find very detailed tutorial:
Windows 10 Forums . After reading the Information in beginning of this tutorial , continue from paragraph 6.
Hope this will solve your problem
thanks for your suggestions.
i was able to fix the drive by getting it out of the NUC, it's an mSata, placing it in an enclosure, connecting it to another pc and ran chkdsk which fixed the file structure error produced by saving a screen shot from the bios.
i was able to replicate the problem by taking another bios screen shot and saving it in a new folder..that folder got corrupted. Bottom line, saving bios screen shots does corrupt the file system.