To be fair, it could have been much worse. (Part of why it made me so glad I don't work tech support is perhaps that I can easily imagine days where it was the easiest phone call to deal with.)

The actual problem was a cinch; I could have sorted it out in seconds if I'd been in the room. What made the phone call a trial was getting the person with the problem to explain what they'd been doing in sufficient detail that I could figure out what the problem they were having was.