Windows installation
https://blog.notebooksbilliger.de/anleitung-windows-10-vom-usb-stick-installieren/
The C prompt (C: \>) tells me that there's an operating system on the computer, MS Dos. Or. Remains of a DOS-based Windows version.
to install the windows you have to, if that works, either switch to the USB stick, for example: by typing in "E:" just try out some letters from D
and then enter "setup" if that funzt.
if not, you have to change the boot order in the bios.
With most bios, you also get into a boot menu when you restart the computer by pressing the F10 key.
Thank you
You bought Windows on a USB stick?
The guy also sells refrigerators at the North Pole. Or air in the forest.