How to configure PEAR ENV windows?

the file .reg generate when finish the pear installa开发者_如何学运维tion was addedd and when i try pear command i get this message:

´PHP_PEAR_PHP_BIN is not set correctly. Please fix it using your environment variable or modify the default value in pear.bat The current value is: .\php.exe´

i'm traying to install PHPUnit

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Set the environment variable in

Control center 
  extended system settings
    extended
      environment variables

alternatively, set it directly in pear.bat - but that change will vanish after the next update.