Makerfarm Calibration Thread of Grand Proportions

[jtice]

I am having an issue when trying to do the EEPROM setting in Ardriuno.
It only lists COM3, and when I try it I get an error saying it cant communicate with device.
Also, in device manager, its listed as RUMBA ATmega 2560 co
But is also has an explanation point next to it.
Is there some place I can download the drivers for it? I assume thats the problem?

EDIT
Nevermind, found the driver here, installed it and it now shows correctly in device manager.
After restarting Ardruino a couple times it then saw COM4, and that worked.