So:

1) enter "cmd" in "run"

what should happen then?

2) enter "ipconfig" in "run"

-when i enter after typing "cmd", there is a message 'the program (or some parts of it) could not be found. Check if the path is right and if the necessary library's are there'

-after that, instantly "ipconfig" appears in "run" but it still disappears when i run it

sorry for my lacking english. I got that message in dutch and couldn't translate it better.