Your safe will remain after an uninstallation as a *.sle file, which you can import after a new installation. Here's a little tutorial:
Navigate to "Safe" in the menu in the top left and choose "Import..." Your safe files are in *.sle format, created and saved on your hard drive. You can find them usually here:
C:\Documents and Settings\%USERNAME%\Application data\Steganos (Windows XP and earlier)
C:\Users\%USERNAME%\AppData\Roaming\Steganos\ (Windows VISTA/ Windows 7/ Windows 8)
If you don´t find the folders, make sure to enable the Windows option "show hidden files and folders" ( http://windows.microsoft.com/de-de/windows-vista/show-hidden-files ).
In Version 2012/ 14/ 15:
Your safe files are located in the folder My Documents and the subfolder Steganos Safe.
If you´ve chosen an another location on your hard drive during the creation process, your files should be still saved there.
Select your *.sle file and import it.