Some users have been reporting that when they try to open Windows Defender Application Guard or Windows Sandbox on Windows 11/10, it fails to open with error code 0x80070003 or 0xC0370400.
The exact error message is:
- ERROR_VSMB_SAVED_STATE_FILE_NOT_FOUND (0xC0370400)
- E_PATHNOTFOUND (0x80070003).
Application Guard or Windows Sandbox error 0x80070003 or 0xC0370400
If you face this issue where Windows Defender Application Guard or Windows Sandbox on Windows 11/10, here are a few things you could try:
- Restart your device
- Install all the pending Windows Updates
- Run SFC and DISM.
Let us see them in a bit more detail.
1] Restart your device
Restart your device and see if the problem goes away. This simple step has been known to help many.
2] Install all the pending Windows Updates
Check for updates for your computer. Maybe Microsoft has released a fix or an update for your system.
3] Run SFC and DISM
Run System File Checker and DISM and see if they help.
To run SFC, in an elevated CMD execute the following command:
In an elevated CMD execute the following command:
Dism /Online /Cleanup-Image /RestoreHealth
This will fix any system image corruption from a Windows Update source.
Incidentally, our freeware FixWin for Windows lets you run both SFC and DISM with the click of a button!
Let us know if anything here helped you.