I recency purchased a StarTech 1 Port USB to RS232 DB9 Serial Adapter Cable from Mwave. It cost $30 and works perfectly on a new ASUS Win 10 64bit laptop.
As soon as I plugged it in, it downloaded a driver and set itself up. It has a genuine Prolific chip and comes with a cd, although I didn't need to use it.
Good Luck and Clear Skies.
Rob
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