Computer Use and Chrome plugin fail to start on Windows 11 Home (windows sandbox failed: helper_unknown_error: setup_refresh had errors)

What version of the Codex App are you using (From “About Codex” dialog)?

26.623.61825

What subscription do you have?

ChatGPT Plus

What platform is your computer?

Windows 11 Home Single Language 25H2, x64

What issue are you seeing?

Computer Use and the Chrome plugin both fail before any browser is launched.

Codex version: 26.623.61825
Subscription: ChatGPT Plus
OS: Windows 11 Home Single Language 25H2, x64
CPU: Intel Core i3-1115G4
RAM: 8 GB

The error happens before opening any browser, including Google.

Error:

windows sandbox failed:
helper_unknown_error: setup_refresh had errors

When testing the Chrome plugin, Codex reported that the failure occurs before connecting to Chrome because the node_repl component cannot start due to the sandbox initialization failure.

Chrome extension is installed and enabled.
Virtual Machine Platform is enabled.
Windows Hypervisor Platform is enabled.

Feedback ID:
019f13b8-4b11-75c0-a2c4-4a863b8f35a2

What steps can reproduce the bug?

Feedback ID: 019f13b8-4b11-75c0-a2c4-4a863b8f35a2

What is the expected behavior?

1. Open Codex on Windows 11 Home Single Language 25H2.
2. Try to use Computer Use to open https://www.google.com.
3. The browser does not open.
4. Try to use the Chrome plugin without Computer Use.
5. The Chrome plugin also fails before connecting to Chrome.

Error shown:

windows sandbox failed:
helper_unknown_error: setup_refresh had errors

Codex also reported that node_repl cannot start because the Windows sandbox setup fails.

Feedback ID:
019f13b8-4b11-75c0-a2c4-4a863b8f35a2

Additional information

Computer Use should start a browser session and open Google.

The Chrome plugin should connect to Chrome and execute browser actions without failing during sandbox initialization.