more computor to race car connection problems! help (again!)

I have an RPM data logger which worked with a previous lap top. I had to buy a new laptop, an HP envy x360. I tried using two different r232 to usba converters, tried down loading the drivers, still keep getting
COULD NOT OPEN SERIAL PORT ERROR CODE Ox2. I don't have a lot more hair to tear out! Please yelp resolve this. it doesn't say port in use, and i was able to connect with my MSD with these components.