I can't launch Spyder

i couldn’t launch Spyder
i deleted and reinstall anaconda repeatedly, but there was no use
the error message says as below

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C:\Users\yorch\anaconda3\lib\site-packages\paramiko\transport.py:219: CryptographyDeprecationWarning: Blowfish has been deprecated
“class”: algorithms.Blowfish,
Traceback (most recent call last):
File “C:\Users\yorch\anaconda3\Scripts\spyder-script.py”, line 10, in
File “C:\Users\yorch\anaconda3\lib\site-packages\spyder\app\start.py”, line 252, in main
mainwindow.main(options, args)
File “C:\Users\yorch\anaconda3\lib\site-packages\spyder\app\mainwindow.py”, line 1822, in main
mainwindow = create_window(MainWindow, app, splash, options, args)
File “C:\Users\yorch\anaconda3\lib\site-packages\spyder\app\utils.py”, line 289, in create_window
File “C:\Users\yorch\anaconda3\lib\site-packages\spyder\app\mainwindow.py”, line 773, in setup
PLUGIN_REGISTRY.register_plugin(self, PluginClass,
File “C:\Users\yorch\anaconda3\lib\site-packages\spyder\api\plugin_registration\registry.py”, line 342, in register_plugin
instance = self._instantiate_spyder5_plugin(
File “C:\Users\yorch\anaconda3\lib\site-packages\spyder\api\plugin_registration\registry.py”, line 184, in _instantiate_spyder5_plugin
plugin_instance = PluginClass(main_window, configuration=CONF)
File “C:\Users\yorch\anaconda3\lib\site-packages\spyder\api\plugins\new_api.py”, line 331, in init
File “C:\Users\yorch\anaconda3\lib\site-packages\spyder\plugins\pythonpath\container.py”, line 55, in setup
File “C:\Users\yorch\anaconda3\lib\site-packages\spyder\plugins\pythonpath\container.py”, line 136, in _load_pythonpath
system_path = get_system_pythonpath()
File “C:\Users\yorch\anaconda3\lib\site-packages\spyder\plugins\pythonpath\utils.py”, line 31, in get_system_pythonpath
env = get_user_env()
File “C:\Users\yorch\anaconda3\lib\site-packages\spyder\utils\environ.py”, line 71, in get_user_env
env_dict = get_user_environment_variables()
File “C:\Users\yorch\anaconda3\lib\site-packages\spyder\utils\environ.py”, line 60, in get_user_environment_variables
res = stdout.decode().strip().split(os.linesep)
UnicodeDecodeError: ‘utf-8’ codec can’t decode byte 0xbf in position 246: invalid start byte

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Great thank you for providing me that information, now let’s try this, the problem may be caused by errors in the Spyder setting and configuration files, we can try to fix it with these instructions:

  1. Close and relaunch Spyder and see if the problem remains.

  2. On the menu, select Start, then select Reset Spyder Settings and see if the problem remains.

  3. Close Spyder and relaunch it from the Anaconda Prompt:

  4. From the Start menu, open the Anaconda Prompt.

  5. At the Anaconda Prompt, enter Spyder.

  6. See if the problem remains.

  7. Delete the directory .spyder2 and then repeat the previous steps from Step 1. Depending on your version of Windows, .spyder2 may be in C:\Documents and Settings\Your_User_Name or in C:\Users\Your_User_Name.

Replace Your_User_Name, with your Windows user name as it appears in the Documents and Settings folder.

Please let us know if that fixed your problem and if you need further assistance we are here to help.

Hi Carlos,
I go the very same problem and following the seven steps above don’t help (btw the .spyder2-folder is named .spyder-py3 on my laptop.)
When I try to start Spyder from the anaconda menu it opens a terminal window and also the Spyder splash screen opens, telling me that it is loading all kinds of resources. Then everything closes and I get the lengthy error message Yangje was posting.
The same happens when I try to start Spyder from the Windows Start-Menu.
Any idea? Please let me know in case you need more information.
Thank you,