Try the following:
Take out the laptops battery.
Disconnect from the power supply.
Press and hold power button for 30 seconds.
Place the battery once again.
Turn the laptop on and keep tapping the Delete key multiple times.
Once in BIOS, Load default values.
Press F10 to save changes and check if you are able to boot to Windows.
If you want to reinstall the OS, please check the support documentation for the key to initiate System Recovery (ideally it would be F8 or F10 depending on the manufacturer.
All the best.