Claude Code bug leaves Cowork broken on Windows 11 ARM64 with missing vfpext service
Ali5ASW · ghdev · 2026-07-18
A GitHub issue against anthropics/claude-code reports a Windows 11 Pro ARM64 bug where enabling Cowork in Claude Desktop fails with Missing HCS services: vfpext.
- The reporter says Hyper-V and all subfeatures are enabled, but vfpext never appears as an installed service.
- Multiple repair attempts — DISM, SFC, and re-enabling Windows features — did not fix the problem.
- The issue suggests a deployment gap on Windows ARM64: the driver exists in WinSxS, but it is never copied into System32\drivers or registered as a service.
- The post asks for clearer diagnostics or guidance beyond the generic missing-service error.
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