Somehow, even though I don't have a windows computer, I was able to fake it for about 10 minutes that I am following his instructions and doing what he tells me. First I had to press Win+r, which I didn't really know what it did, but I suspected it opened the CMD, so I told him that a new window opened, a black one. Then he spelled to me what I should write (I don't remember what, I didn't have anything to write with me).
Then he asked me if I had Chrome installed, I said yes and he spelled a website url to me. I told him that it loaded and there was a "Download" button and asked if I should click it. He said yes. Then he talked me through how to install it, from his description I got that it was TeamViewer.
He told me to start it, bare in mind that this was painfully slow for both of us because I had to come up with plausible mistake to make and had to think of some plausible but generic answers on the way because he always asked me what I'm seeing on the streen now. After I "started" it I had to tell him that in fact I didn't have a computer in front of me, but I only was playing along with his script.
He stopped for a couple of seconds and then he asked me:
"How is this possible ...? Why are you waisting my time??"