I have two PA241W monitors and have been using Spectraview since I purchased them. (I run Windows 10.) Absolutely, the most painless way to regularly profile them. I've been using my very old, but still good Eye1 Pro to calibrate, but just recently (because X-rite wants truly obscene amounts of money to upgrade), the Colorvision Spyder 5 Elite. An equally painless experience and no discernible differences .
So to your problem. You can only have one calibration software running at a time. Disable idisplay. Also, Spectraview is not anticipating that you are using a notebook and an external. It only looks for NEC monitors, and those need to be connected via USB so there is two-way communication. For that reason, you may need to temporarily use idisplay for notebook calibration (I'm not really familiar with the program), and after doing so, disable it and reboot. The computer should read the calibration file .