How do I schedule an appointment with a genius to help me uninstall a potential malware program?

I don't think you need any appoitment for that, but if you are using Windows 10 you can do it by your self, go to setting, Update & Security, Recovery, Reset this PC, Get Started, you can keep you personal files or remove them, and than reinstalls Windows.

You can call in to 1-800-my apple, go physically in the store, download the apple support app on your phone, or go to support.apple.com