Missing Applications folder

[Ajay Goel]

On QS I very frequently type appl to navigate to the /Applications  
folder, right arrow to see the list of application and launch it.  All  
of a sudden when I type appl it does not show /Applications as a  
folder but I see "show entry in catalogue."  When I click show content  
I the the number of items in the bottom of QS window as 135 but the  
contents aren't visible.

I have no idea what did I do :-(