Make sure your Windows operating system is up to date.
You can remove and reinstall Windows Sandbox.
Check if any Group Policy settings are affecting Windows Sandbox. Open the Group Policy Editor (gpedit.msc), navigate to "Computer Configuration" > "Administrative Templates" > "System" > "Device Guard" > "Turn On Virtualization Based Security," and make sure it's set to "Not Configured" or "Enabled."
Sometimes, third-party security software or system optimization tools can interfere with the functioning of Windows features. Temporarily disable or uninstall such software to see if it resolves the issue.