When you want to use bfgminer you have to use the vcpi driver which can be found by here > https://www.silabs.com/documents/public/software/CP210x_Universal_Windows_Driver.zip
However if you use cgminer you have to switch to the zadig driver.
In my experience the zadig driver is a pain in the behind, caused me many issues when using my blades.
Anyway you can not install both so only 1 driver can be installed to prevent even bigger issues.
Only have 2 left of them which run for nostalgic reasons at my house.