[BUG] HCS operation failed: failed to start VM: HcsWaitForOperationResult failed with HRESULT

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

This error has been showing for 4 days and I can't use co work effectively. HCS operation failed: failed to start VM: HcsWaitForOperationResult failed with HRESULT

What Should Happen?

Claude co-work should work normally

Error Messages/Logs

HCS operation failed: failed to start VM: HcsWaitForOperationResult failed with HRESULTHCS operation failed: failed to start VM: HcsWaitForOperationResult failed with HRESULT 0xc03a001a: {"Error":-1069940710,"ErrorMessage":"由于虚拟磁盘系统限制，无法完成请求的操作。虚拟硬盘文件必须是未压缩和未加密的文件，并且不能是稀疏文件。","ErrorEvents":[{"Message":"“cowork-vm-e0936824”无法启动。(虚拟机 ID BDAF92EC-9202-55A9-913A-0CDC98DC0E51)","Provider":"51ddfa29-d5c8-4803-be4b-2ecb715570fe","EventId":12030,"Flags":13,"Data":[{"Type":"String","Value":"cowork-vm-e0936824"},{"Type":"String","Value":"BDAF92EC-9202-55A9-913A-0CDC98DC0E51"}]},{"Message":"“cowork-vm-e0936824”Synthetic Storage (实例 ID 1FF46D3F-E712-5DBC-9813-AAD51981A2E9): 无法打开电源，因为发生错误“由于虚拟磁盘系统限制，无法完成请求的操作。虚拟硬盘文件必须是未压缩和未加密的文件，并且不能是稀疏文件。”(0xC03A001A)。(虚拟机 ID BDAF92EC-9202-55A9-913A-0CDC98DC0E51)","Provider":"51ddfa29-d5c8-4803-be4b-2ecb715570fe","EventId":12010,"Flags":5,"Data":[{"Type":"String","Value":"cowork-vm-e0936824"},{"Type":"String","Value":"BDAF92EC-9202-55A9-913A-0CDC98DC0E51"},{"Type":"String","Value":"Synthetic Storage"},{"Type":"String","Value":"%%3225026586"},{"Type":"String","Value":"0xC03A001A"},{"Type":"String","Value":"1FF46D3F-E712-5DBC-9813-AAD51981A2E9"},{"Type":"String","Value":""}]},{"Message":"“cowork-vm-e0936824”: 附件“C:\\Users\\MI\\AppData\\Roaming\\Claude\\vm_bundles\\claudevm.bundle\\smol-bin.vhdx (Lun 1)”无法打开，因为出现错误“由于虚拟磁盘系统限制，无法完成请求的操作。虚拟硬盘文件必须是未压缩和未加密的文件，并且不能是稀疏文件。”(0xC03A001A)。(虚拟机 ID BDAF92EC-9202-55A9-913A-0CDC98DC0E51)","Provider":"edacd782-2564-4497-ade6-7199377850f2","EventId":12140,"Flags":5,"Data":[{"Type":"String","Value":"cowork-vm-e0936824"},{"Type":"String","Value":"BDAF92EC-9202-55A9-913A-0CDC98DC0E51"},{"Type":"String","Value":"C:\\Users\\MI\\AppData\\Roaming\\Claude\\vm_bundles\\claudevm.bundle\\smol-bin.vhdx (Lun 1)"},{"Type":"String","Value":"%%3225026586"},{"Type":"String","Value":"0xC03A001A"},{"Type":"String","Value":""},{"Type":"String","Value":""}]}],"Attribution":[{"OperationFailure":{"Detail":"Start"}},{"VirtualDeviceFailure":{"Detail":"PowerOnCold","Name":"Synthetic Storage","DeviceId":"d422512d-2bf2-4752-809d-7b82b5fcb1b4","InstanceId":"1ff46d3f-e712-5dbc-9813-aad51981a2e9"}}]}
Restarting Claude or your computer sometimes resolves this. If it persists, you can reinstall the workspace.

Steps to Reproduce

<img width="1097" height="851" alt="Image" src="https://github.com/user-attachments/assets/8d36acdd-c19e-4064-9cfa-01454c4b9b72" />

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

clude cowork

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Terminal.app (macOS)

Additional Information

claude-diagnostic-4d3584a8-20260610-0148.zip