Most of the times, we either discard such apps or install them risking malware infections.
your machine could be at risk if you are careless with the links you click and files you download.
These help put up together a virtual environment that is secluded from the rest of the machine.
To bring up the main window to the screen, double-press the tray icon.
Sandboxed windows have a purple margin that appears when moving the mouse pointer over it.
Sandboxie
Sandboxie creates a yellow icon in the systray after installation.
Tick the Run As UAC Administrator box, if you have to run it with administrative rights.
Click Ok to continue.
Sandboxed windows are enclosed by a yellow border that appears when moving the mouse pointer to the title bar.
source: www.techworm.net