Something missing, can't Go

For reasons that escape me, the error message "Something missing, can't Go" popped
into my mind this evening. Probably something about nostalgia and old age. In
any case, though, let's see just how small the world really is... there's a prize
for the first person who can tell me what the name of the program was.  (And
yes, it will be a better prize than the Santa
Pants
.)