Yeah, its the worst over the phone...when in person you can just pull a Nick Burns "Move!" and get in there and go to it.
Over the phone...OMG.
You: "Double click on my computer"
Them: "Ok...Nothing happened, this stupid peice of junk! It must be frozen"
You: "You have to double click on it"
Them: "I did!"
You: "Try it again"
Them: "Oh, now it works"
You: "Click on the start menu"
Them: "Whats the start menu?"
You: "Stab yourself in the face with a pen"
Its horrible because you never know if they messed up a double click, or like a virus scanner update thing happens to come up and freak them out. Heaven forbide you have to do something that you can't envision the entire process in your head...like they use award bios and you don't have it to follow along with them.
This one seriously happened to me, the woman's computer was not detecting its hard drive so it needed to be rebooted and to go into bios.
Her: "It says primary master hard disk fail, insert boot disk to continue."
Me: "Ok, you need to restart the computer. Press control alt and delete at the SAME TIME."
Her: "Nothing happened."
Me (somewhat confused): "Well, ok, lets do it the hard way I guess. Turn the computer off and then turn it back on."
Her: "What do I do?"
Me: "Press the power button, it probably has a circle with a small line going part way through it. Its round. Hold it down for 5 seconds, then release. Then press it again to turn it back on. It should beep...right after that start tapping delete."
Her: "Ok...."
Her: "It says...primary hard disk fail still."
Me (WTF? no boot?): "Ok...uh...try using the reset button, its right below the power button and is smaller and green."
Her: "I don't see it...is it near contrast?"
Me: "No, its on the computer...not the monitor." (stifling rage)