[doktorabg]

If you have many FTDI drivers than comes conflict.
Use FTCLEAN. EXE and install again one by one.
Here is the rights setup of BMW USB K+DCAN with right driver.

The best drivers are the newest drivers from the USB-COM chip manufacturer.
There is no such thing as BMW drivers.
Currently the latest is 2.12.16 and could be downloaded from the manufacturer page.
FTClean is also a nice tool and is official from FTDI. FTDI removed the link on it from the Utilities page, but the tool is still there .

Hey , I don't say that there is BMW DRIVERS!
I say that if you have many FTDI drivers install in PC than comes the problem for K+DCAN like latency timer is set to 16 and not to 1and another settings to and you must manuell make it.
On fresh install you become the rights settings like on pictures, look it carefully!