Hello Dan, I’m sorry to hear that you are having this kind of problems with your NUC.
Would you please check if Enhanced consumer IR has been enabled in BIOS?
We tested CIR using a TSGH-IR02 remote control on a D54250WYK NUC and CIR worked just fine on a Windows environment.
Which operating system are you using?
Apologies for the delay in responding to you. Yes the IR is enabled in the BIOS. The remote I am using is a Media Center remote and as I mentioned previously it was working until recently when I tried to update the drivers because I was unable to power the device on and off from the remote.
So I tried disabling the IR in the BIOS and rebooting. I then re-enabled it and re-ran the driver install for version 2.9.1007 for Windows 8.1 and this time it has installed and the remote is working correctly. The unknown device is also no longer showing in device manager so it looks like that resolved it.