Click here for a very useful trick you can use whenever you want to paste code into the forum.
From what I can see, it could be a problem with your indentation as your code logic seems fine.
This would be the proper indentation for your
print 'Welcome to the Pig Latin Translator!'
# Start coding here!
original = raw_input("Enter a word:")
if len(original) > 0 and original.isalpha():