Have you ever been working and something goes wrong and you are presented with some error code that makes no sense? If so, then you know how much of a pain in butt that it can be.

A while back I stumbled across Err.exe, a neat little utility that Microsoft had built. From the command line you enter the error code and it shows all possible meanings from the Microsoft message dlls that it knows about. Even though it doesn't give you a single answer the ability to review all possible meanings of the error will allow you to make a very good educated guess about the root of your issue.