Cannot uninstall or access bios

I have a samsung laptop on which I loaded Parrot OS. Not as a dual boot with windows but rather as the only OS. I did this by installing a new SSD and putting Parrot OS on that . I want to revert back to Windows to sell the laptop by I cannot do it . Even if I put the windows 10 disc back in when I boot it comes up with Parrot as the boot option.

Can anyone help with this?

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do you have two drives? one is ssd for parrot and another is hdd for windows? or you just have ssd with parrot?