Do you get an error messages that says "AppleTalk cannot be opened"? A common (although not the only) cause of this is that the needed Open Transport library files are not properly installed in your Extensions folder.
Google aims directly at Apple
Google I/O 2013 showcases updates to Google Maps, Google Now, and Hangouts that will all be on iOS. Check out the iOS 7 concept video that's worth watching, and an iPhone 5 case giveaway!