I got a call from recently from someone claiming to be a Dell tech rep. He said my laptop was reporting multiple errors. Realizing immediately that this was a scam I let him continue while I started a Windows 7 Virtual Machine session. Because I had some free time I let him talk me through all the steps of how to view the "critical" errors in the event viewer, making sure to misunderstand him due to his accent. This required that he repeat himself frequently and phonetically spell out anything he wanted me to type. By the time he was ready to remote into my laptop I had the VM session up and running where I was able to waste still more of his time. Unfortunately by the time he was ready to "fix" things I had run out of time and patience. All I had time to do at that point was to point out exactly what I thought of him and his choice of vocation.
I hope that the next time they call I have the time to let them loose on a clean VM session to see what they do with it.