If you are deleting an application which you purchased from BlackBerry App World, you can always install it again at no charge. Here’s how:
Highlight and click on the BlackBerry App World icon.
Scroll to and enter “My World” (Bottom right).

Scroll to and select the app you wish to re-install.

Tips & Warnings
Another way to handle apps that you may not need right now but don’t want to delete is to put them in a folder. This is an easy way to keep them organized and accessible should you decide to use them at another time. See “How To Move and Icon to a Folder on Your BlackBerry” for details.
Hi Faith. I'm sorry but can you tell us what kind of problem you are experiencing?