How to Fix Windows Sandbox Not Launching or Crashing on Start on Windows
Windows Sandbox won't start? Sandbox crashes immediately after launch? "Windows Sandbox failed to start" error? Sandbox stuck on loading screen? Hypervisor not running for Sandbox? Fix Windows Sandbox launch issues.
Symptoms
You might be experiencing this problem if you notice:
- •Windows Sandbox fails to start with an error message
- •Sandbox window appears briefly then closes
- •Error: "Windows Sandbox failed to initialize"
- •Sandbox stuck on "Initializing..." or loading screen
- •Hypervisor-related error when launching Sandbox
- •Sandbox option grayed out or missing from Start menu
Common Causes
- ⚠Virtualization (VT-x/AMD-V) disabled in BIOS
- ⚠Hyper-V or Windows Hypervisor Platform not enabled
- ⚠Windows Sandbox feature not installed
- ⚠Conflicting hypervisor (VirtualBox, VMware)
- ⚠Insufficient RAM (needs 4GB+ free)
- ⚠Corrupted Sandbox container image
Solutions
Solution 1: Enable Required Features
- 1Ensure virtualization is enabled in BIOS/UEFI:
- 2Restart PC → enter BIOS (Del, F2, or F12 at boot)
- 3Find: Intel VT-x, AMD-V, or SVM Mode → Enable
- 4Save and exit BIOS
- 5Enable Windows features:
- 6Control Panel → Programs → Turn Windows features on or off
- 7Check: "Windows Sandbox"
- 8Check: "Windows Hypervisor Platform"
- 9Check: "Virtual Machine Platform"
- 10Click OK → restart when prompted
- 11Or via PowerShell as Admin:
- 12Enable-WindowsOptionalFeature -Online -FeatureName "Containers-DisposableClientVM" -All
- 13Restart PC
Solution 2: Fix Hypervisor Conflicts
- 1Check if Hyper-V hypervisor is running:
- 2CMD as Admin: systeminfo | findstr "Hypervisor"
- 3Should show: "A hypervisor has been detected"
- 4If not shown — hypervisor isn't running:
- 5bcdedit /set hypervisorlaunchtype auto
- 6Restart PC
- 7If VirtualBox or VMware is installed:
- 8These can conflict with Windows Sandbox
- 9VirtualBox 6.x: may need to switch to Hyper-V backend
- 10VMware Workstation 15.5+: supports Hyper-V coexistence
- 11Older versions: may need to disable, use Sandbox, then re-enable
- 12Check: bcdedit /enum | findstr "hypervisorlaunchtype"
- 13Should be "Auto" — if "Off", Sandbox won't work
Solution 3: Reset Sandbox and Fix Container
- 1If Sandbox was working but stopped:
- 2Reset the Sandbox container:
- 3PowerShell as Admin:
- 4Disable-WindowsOptionalFeature -Online -FeatureName "Containers-DisposableClientVM"
- 5Restart PC
- 6Enable-WindowsOptionalFeature -Online -FeatureName "Containers-DisposableClientVM"
- 7Restart PC again
- 8Check system resources:
- 9Sandbox needs: 4GB+ RAM free, 1GB+ disk space
- 10Task Manager → Performance → verify available memory
- 11Clear temp Sandbox data:
- 12Delete contents of: C:\ProgramData\Microsoft\Windows\Containers\Sandboxes
- 13If feature is missing entirely:
- 14Requires Windows 10/11 Pro, Enterprise, or Education
- 15Windows Home does NOT include Windows Sandbox
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