Erk...I don't know
Download the latest LW Beta & see if the same thing happens. You can download the Beta version from the normal LW download page.
After you install the Beta version, delete LW's preferences folder. Make sure LW's not running (check in task manager). See point 3 below.
Fixes for LimeWire
Did you download the original LW (that you installed first) from
www.limewire.com ?