Hi ! I already seen that, looks like the windows fall update have been a bit aggressive with the installed drivers ( Microsoft ...)
You need to reinstall the drivers, Here is the how-to,
http://wiki.seeed.cc/Download_Arduino_and_install_Arduino_driver/
Instead of downloading again the whole arduino package you can look here when the drivers are requested in the how-to : C:\Program Files (x86)\SimHub\_Addons\Arduino\ArduinoIDE\arduino-1.6.13\drivers\FTDI USB Drivers
ok thank you! also i unplugged my nextion, swapped usb cord and it somehow finally connected under COM4 instead of the COM3 that it was connecting under. Makes sense because my Nextion display is currently connected to COM3 so that was probably causing the conflict.
thank you for a wonderful product, i just made a donation to you