Command/DOS box

[Midknyte]

When I click on Start>Run>regedit or some other command. e. g. msconfig, a familiar black window opens.
If I type something else, e. g. <ipconfig>, the black box stays open for a second or less (there is no time to read a few lines seen there) and disappears.
What gives? Can it be repaired?

msconfig is not a DOS app, so it will open and the command window closes. That is no different from when you run ipconfig. The ipconfig runs, and the command window closes. THERE IS NOTHING TO BE REPAIRED.