Right click and copy the limewire shortcut (icon) on your desktop.

Open windows explorer, then paste the shortcut into your wife's desktop directory. It should be located at:
c:/documents and settings/your wife's account name/desktop



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tech note from faq:
LimeWire is a java based program, and is run by the executable javaw.exe. The proper way to launch LimeWire is with the shortcut provided on the desktop or in your programs menu. If desired, advanced users can create a Windows batch file that can be used to launch LimeWire. Furthermore, double clicking on the file RunLime.jar will launch LimeWire if your system is configured to associate the file extension .jar to Java.