Currently Being ModeratedDec 18, 2011 7:28 PM (in response to kristie_apple)
Try a Reset...
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears. Release the Buttons.
Restart / Reset...
See here for
And here for
Currently Being ModeratedDec 19, 2011 7:36 PM (in response to kristie_apple)
Try signing out and logging bak in under Settings/Store and tap your apple ID.
And don't disable Facetime as that disables iMessage also. Not sure if that bug was fixed in 5.0.1