Vampire bats are the only bats that can run!
There are a few bats that can walk, and they do it in order to search for things at ground level. Vampire bats do this specifically to sneak up on sleeping animals (usually cows, birds, or other mammals depending on the species) to get a meal.
However, unlike other species, the common vampire bat (Desmodus rotundus), can run. Unlike most other animals which use their hind legs to propel themselves forwards, vampire bats use their windows to propel themselves.