When I connect my USB-to-RS232 ADAPTER on USB 2.0 port on Windows 7 (64-bit), I get:
Device driver software was not successfully installed
Prolific USB-to-Serial COMM Port (Failed)
On Device Manager Properties, Device Status is: This device cannot start. (Code 10)
When I update driver, message is: The best driver software for your device is already installed but device error is remaining. I also downloaded and installed driver from Prolific website but same result.
Checking chip version I get: OPEN COM PORT FAILED
What is actually wrong on accessing this device?