(base) PS C:\Users\Administrator> conda install -c anaconda scikit-learn Collecting package metadata (current_repodata.json): failed UnavailableInvalidChannel: HTTP 404 NOT FOUND for channel conda-forg <https://conda.anaconda.org/conda-forg> The channel is not accessible or is invalid. You will need to adjust your conda configuration to proceed. Use `conda config --show channels` to view your configuration's current state, and use `conda config --show-sources` to view config file locations.

看起来您的 conda 配置中的 conda-forge 频道仍然无法访问。您可以尝试使用以下命令将 conda-forge 频道从您的配置中删除：

conda config --remove channels conda-forge

然后再运行以下命令来安装 scikit-learn：

conda install -c anaconda scikit-learn

这应该会从 anaconda 频道安装 scikit-learn。如果您仍然遇到问题，请让我知道。