If you just type the ipconfig /all command in the run box (there are actually about 4 boxes you can use in Vista) the command window opens but closes immediately when the command finishes executing, so you don't get a chance to read the result.
Start|Run, type "command" in the box and hit Enter (or click OK) to open a "command window" (formerly called a DOS window, and now called by at least 7 or 8 different things in Vista - but all doing the same thing). In the DOS window, type the ipconfig /all and you'll see the result.
And remember that the "command" to close the "command window" is "Exit."