from ambiant weather I did everything that needs but this does not work
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Solution
If you have already installed WeatherLink 5.8 and selected the USB communication option (from the Setup | Communications Port… window), you must remove and reinstall WeatherLink 5.8.
To remove WeatherLink 5.8, select Add / Remove programs in Windows and unintstall WeatherLink 5.8.
Reinstall WeatherLink 5.8, but do not restart the program at this point. To download the latest version of WeatherLink, please visit:
http://www.davisnet.com/support/weather/software_sftwr.asp
Note: If you have already installed the USB to UART bridge version 5.1 (next step), a pop-up box during WeatherLink installation will inform you that 5.1 is installed and to use add/remove programs to remove it