I hear what you’re saying… “What the..? Nothing changed!”
Ah, but are you running Skype? If so, turn it off and try again.
Skype grabs port 80 unless that port is otherwise occupied. Launch Apache first, or choose an alternative HTTP port.
Would be nice if the error message was something a little more clear. How about “Cannot acquire port 80”? But, nah.. that would ruin all the fun.