http://bugs.winehq.org/show_bug.cgi?id=31027
--- Comment #2 from sworddragon2@aol.com 2012-06-26 10:36:40 CDT ---
You probably have 64-bit wineprefix (for which both 32-bit and 64-bit Gecko should be installed, thus there are two dialogs)
Maybe the dialogs should say for which architecture they are trying to install the related packages.