USBUART - Putty - Unable to open communication to COM6

[Tranzystomator]

Hi,

I have problem with connecting with my USBUART port. I restarted my computer. It is still the same. Do you have any suggestion? How can I debbug that? 

[Tranzystomator]

I was able to establish that my COM6 port was blocked by usbser.sys. Maybe someone have any solution?