Here is some code to get the information you're looking for with console output
You can also look here for some more information or ideas
http://www.kixtart.org/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=2&t=004424






IF @INWIN = 1
  SELECT
    CASE @ProductType='Windows 2000 Professional'
      IF @CSD <> 'Service Pack 4'
        ? 'Your SP is: '+@CSD+'  We will now run an update'
        ; run update code here
      ENDIF
      IF @CSD = 'Service Pack 4'
        ? 'Your system is running the latest Service Pack: '+@CSD
        ? 'No update required'
      ENDIF
    CASE 1
      ? 'Your system does not appear to be a Windows 2000 Workstation'
      ? 'We show it as: '+@ProductType+' - '+@CSD
      QUIT @ERROR
  ENDSELECT
ENDIF