A BSOD after installing Deep Freeze on Windows 11, preventing Safe Mode and Recovery Mode access, is critical. First, try forcing Automatic Repair by repeatedly interrupting boot. If that fails, boot from Windows 11 installation media and attempt Startup Repair, System Restore (if a point existed before Deep Freeze), or Command Prompt for advanced fixes like sfc /scannow
or DISM. As a last resort, a clean Windows 11 installation will resolve the issue but will erase your data. Consider professional help if you're uncomfortable with these steps or if they fail. In the future, ensure software compatibility and create system restore points before installing.