Direct transfer between two computers

One of my computers got a virus … for the 100th time! :sad2: I’ve already scanned “My Documents” (200 GB) and the virus is not in there. I want to back this folder up before I reinstall Windows. I have no router or large external harddrive. How does one go about connecting ethernet to ethernet between to computers? I’m having a hard time finding info because the virus keeps on redirecting my browser.