{
  "$type": "site.standard.document",
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  "path": "/t/windows-launch-failure-code-3221225781-root-cause-was-missing-vcruntime140-1-dll/1378391#post_2",
  "publishedAt": "2026-04-22T05:50:53.000Z",
  "site": "https://community.openai.com",
  "textContent": "I ran into this on Windows:\n\nCodex crashed with:\n(code=3221225781, signal=null)\nMost recent error: None\n\nIn my case, installing the Microsoft Visual C++ Redistributable alone was not enough.\nThe required runtime DLL seemed to be present, but Codex still crashed.\n\nWhat finally fixed it was:\n\n  1. install / repair the VC++ runtime\n  2. reinstall Codex after that\n\n\n\nSo on my machine, it looks like the installer and/or the first-launch path depended on the VC++ runtime, and simply installing the runtime after Codex was already installed did not fully fix the issue.\n\nPosting this in case it helps someone else who hits code=3221225781 on Windows.",
  "title": "Windows launch failure code 3221225781 — root cause was missing vcruntime140_1.dll"
}