Start -> Search -> Acer Arcade -> Start search -> when application is found single left click to highlight it -> right click on highlighted area -> send to -> Desktop (create shortcut) -> double click on new Acer Arcade` desktop icon to test the program.
If the above does not fix the problem:
start -> all programs -> accessories -> system tools -> system restore -> restore my computer to an earlier time -> next -> select a bold date on the calendar to the left and an even in the event schedule to the right that both precede/predate whatever change in settings that caused your application's icon or file directory to change configuration -> restore -> restart computer without interrupting to complete restore process -> look for the lost program in its usual place.
If none of these resolve the problem, then the programs may have accidentally been deleted by yourself or perhaps by another user, without your knowledge.
The following Site has links to download and install your lost application or, alternatively, the deluxe version:http://komku.blogspot.com/2008/05/download-acer-arcade-deluxe-for-windows.html