Windows 10 won't boot without USB after installation from usb.

[Microsoft Windows]

Hello. I have an old laptop which my father installed windows 11 on. I saw that the laptop was struggling quite a bit running windows 11 so I decided to degrade back to windows 10. I have a 64 gb usb with windows 10 installation media so I plugged it in and made a fresh install. The installation went smoothly and windows 10 started running. I switched off the laptop and removed the USB thinking it's job was over but no. The laptop won't boot windows without the USB now. If I don't have the USB plugged in, I go into a bios loop where booting up the hdd or anything else won't work and I'm stuck

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