Prolific-based USB to serial dongles do not like being removed and reattached, always insert/remove them after the PC is powered off.
Also, to maintain the SAME COM PORT consistently, always plug the
unit into the SAME USB port.
Updated drivers for Prolific are available here... use these as
they are updated with more fixes than the packaged disc...
http://www.prolific.com.tw/eng/downloads.asp?ID=31
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