selenium error :

[evilcode1]

hello all ...
im trying to use selenium i keep getting this error :

Error:
Traceback (most recent call last):
  File "c:/Users/root/Desktop/token.py", line 3, in <module>
    browser = webdriver.Firefox(executable_path=r"C:\Users\root\Desktop\geckodriver.exe")
  File "C:\Python27\lib\site-packages\selenium\webdriver\firefox\webdriver.py", line 164, in __init__
    self.service.start()
  File "C:\Python27\lib\site-packages\selenium\webdriver\common\service.py", line 95, in start
    (os.path.basename(self.path), self.start_error_message, str(e)))
selenium.common.exceptions.WebDriverException: Message: The executable geckodriver.exe needs to be available in the path.
'module' object has no attribute 'system'

my code :

from selenium import webdriver

browser = webdriver.Firefox(executable_path=r"C:\Users\root\Desktop\geckodriver.exe")
browser.get('http://www.google.com')

when i run the code for the second time the error is :

Error:
Traceback (most recent call last):
  File "c:/Users/root/Desktop/token.py", line 1, in <module>
    from selenium import webdriver
  File "C:\Python27\lib\site-packages\selenium\webdriver\__init__.py", line 18, in <module>
    from .firefox.webdriver import WebDriver as Firefox  # noqa
  File "C:\Python27\lib\site-packages\selenium\webdriver\firefox\webdriver.py", line 29, in <module>
    from selenium.webdriver.remote.webdriver import WebDriver as RemoteWebDriver
  File "C:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 27, in <module>
    from .remote_connection import RemoteConnection
  File "C:\Python27\lib\site-packages\selenium\webdriver\remote\remote_connection.py", line 20, in <module>
    import platform
  File "c:\Users\root\Desktop\platform.py", line 4, in <module>
    os.makedirs(d+"/test")
  File "C:\Python27\lib\os.py", line 157, in makedirs
    mkdir(name, mode)
WindowsError: [Error 183] Cannot create a file when that file already exists: 'C:\\Users\\root\\AppData\\Roaming/test'