I am amazed when I get those "I am calling from Microsoft Technical Support, you have errors on your computer...." calls, and they lead you though opening event viewer - and try to tell you how terrible all the errors are. For the first couple of times I went along with it, then one guy decided I had a WiFi error - an argument then ensued as I told him the PC in question wasn't connected via WiFi. A couple of times I tried pulling rank on them and announcing that I have been a computer and server systems engineer for 35 years, and I am Microsoft certified (all of which I am), and asking them "do you want to continue"? - if they carry on I ask them "what is the IP address of my PC"? - that is usually enough to make them realise that further discussion will be futile. Other times, for a change, I just tell them I am running Linux.