The third option is to install some Linux like Ubuntu or Linux Mint on it.
It is nowadays actually easier to install Ubuntu Linux than a Windows. Just be sure to back up your data to an external hard drive, and restore it from there after the install.
Ubuntu/Linux Mint are actually the worst, for the simple reason that when I tell it to install to a specific, completely empty drive, it will still insert its bootloader onto a completely different drive for absolutely no reason(except it being earlier in the boot order). Absolutely baffling design choice.
It is nowadays actually easier to install Ubuntu Linux than a Windows. Just be sure to back up your data to an external hard drive, and restore it from there after the install.