It appears that you have to use a modern PC with windows 10 factory installed.
The only way I can get the Nastar software to perform is by running it on a new PC. My Windows 10 upgrade machine is sluggish too.
I went out and bought a Dell Insprion 15 at Staples for $250.00 and installed 2 ATEN brand USB to serial adapters.
No issues with the NASTAR software. Many Many issues with trying to use VOLA and the USB to serial adapters though. Different forum though.