For your information the messaging App has bee replaced by Skype in Windows 8.1 and probably only a question of time before it is removed in Windows 8. Hope this helps and if you need any further assistance post and we will be glad to help you.
The above opinion is mine and mine alone and doesn't necessarily reflect that of Microsoft, it's employees, or any other member of this forum.
"When we try to pick out anything by itself, we find it hitched to everything else in the Universe." - John Muir