As the system is running Windows the tools we use on the Mac systems need to run under macOS as they access the hardware differently than what Windows does.
Do you have an external drive which you can format and install macOS onto it for your Mac system. Just make sure you are running a supported version of macOS this system supports.
Follow this guide to download the OS installer [https://support.apple.com/en-us/102662|How to download and install macOS] then with your system format and install the OS onto the external drive. Once installed your system will reboot under the external. Shut down and disconnect the external and make sure your system boots up. If not leverage the ***Option (⌥)*** or ***Alt*** key to enter into the Startup Manager. Here’s a more details [https://support.apple.com/en-us/102603|Mac startup key combinations]
OK, with this external you should be to boot up under it, leveraging the same ***Option (⌥)*** or ***Alt*** key to gain access to the Startup Manager to select the external. But before you do that you’ll want to install CoconutBattery onto the external.