Can't install hdbscan on windows 11: "'building._hdbscan_tree' extension error: [WinError 5] Access is denied"

Nobody has claimed this yet.

I am struggling to get bertopic installed on a windows machine. hdbscan seems to fail everytime. Here are the details of what I trying to do and what i have done:

1. I am trying to install in a virtual environment
2. Initially i ran into the problem regarding MS c++ 14. I installed, and that error disappeared.
3. Now i get the error error:
```
...
tree = Parsing.p_module(s, pxd, full_module_name)
building 'hdbscan._hdbscan_tree' extension
[WinError 5] Access is denied
[end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed building wheel for hdbscan
Failed to build hdbscan
ERROR: Could not build wheels for hdbscan, which is required to install pyproject.toml-based projects
```
4. I get this error when i try `py -m pip install bertopic` and when i try `py -m pip install hdbscan`
5. I have tried updating pip: `py -m pip install --upgrade pip`
7. I have tried running everything from a command prompt (rather than from my IDE)
8. I have tried rebooting the machine and only opening a command prompt and running the install
9. I have tried running from powershell as an adminstrator - using `python` rather than `py` when executing the above calls.

If anyone can tell what might be causing this permission error, I would be enormously appreciative.

Start by reproducing the reported Windows 11 installation failure with `py -m pip install hdbscan` in a virtual environment, then compare it with `py -m pip install bertopic`. Done means identifying a reproducible cause for the `hdbscan._hdbscan_tree` build permission error and confirming that installation succeeds.

Written by the indexing model from the issue text.