Error executing Jupyter command lab : [WinError 5] 拒绝访问。

This error message suggests that the Jupyter command is being denied access to something on your Windows system. This could be due to a permissions issue or an antivirus program blocking the command.

Here are a few steps you can try to resolve the issue:

1. Run the command prompt as an administrator: Right-click on the Command Prompt icon and select "Run as administrator" from the context menu.

2. Check your antivirus program: Some antivirus programs can block Jupyter commands from running. Try temporarily disabling your antivirus program and see if the command works.

3. Check file permissions: Ensure that the files and folders you are trying to access have the correct permissions for your user account.

4. Check the Jupyter installation: Make sure that Jupyter is installed correctly and that all dependencies are up to date.

If none of these steps work, you may need to consult with a Windows expert or Jupyter support to troubleshoot the issue further.