USB - serial adapter com port assignment changes

wbanz01

Bit poster
I have a Windows application which communicates with a weather station through a com port. I have installed Prolific Technologies USB-Serial Driver which comes with the USB-Serial adapter which comes with the weather station. The Weather software configuration assigns a Com Port number.
However, whenever Windows is restarted (Vista running under Parallels 7) the USB - Serial Adapter is assigned a new Com port number and the software cannot communicate with the weather station.
Is there a way I can define a fixed Com Port number for the USB-Serial Adapter?
Thanks.
 
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