# Degraded functionality for Claude Cowork on Windows

- Provider: [Anthropic](https://down.guide/anthropic)
- Level: confirmed
- Impact: Partial outage
- lasted 4d 3h
- started 2026-09-10 15:54 UTC
- Claude Cowork
- us
- id: DWN-01e171c9bd
- Official page: https://stspg.io/5yp3rhhztm30

## Updates from Anthropic
### 2026-09-10 15:54 UTC: identified
A Windows update released September 8 has left Claude Cowork on Windows unable to run local commands, because its workspace can no longer reach your computer's drive. For most users, chat and file reading and editing still work. There's no in-app workaround yet, and restarting or reinstalling won't help. Microsoft has developed a fix and is working to release it. We'll post an update when we have more to share.

### 2026-09-14 19:14 UTC: resolved
This issue has been resolved. Microsoft has released a September 14 Windows update that fixes it: https://support.microsoft.com/en-us/servicing/os/windows-11/2026/09/kb5129195-windows-11-24h2-25h2-security-update

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