Unable to execute shell commands

What version of Codex is running?

codex-cli 0.27.0

Which model were you using?

unrelated

What platform is your computer?

Windows

What steps can reproduce the bug?

I do not know how to reproduce this. I simply installed the CLI through the steps provided and ran it.
The problem persists whether I open codex through CMD and PowerShell, also with administrator privileges.

I also use Gemini CLI which works fine.

What is the expected behavior?

The CLI running shell commands.

What do you see instead?

<img width="1004" height="321" alt="Image" src="https://github.com/user-attachments/assets/451138e9-89d5-4d3c-8afc-572b4722ebf5" />

When trying to run shell commands, the CLI reports "program not found"

Additional information

It is not able to execute any shell commands.
It appears creating/writing files uses the built‑in apply_patch API, but reading files uses shell, therefore it is able to write files but not read them.

I purchased a Plus subscription specifically for Coxed; really hope somebody can shed some light on this.