Try uninstalling Limewire and updating to the latest current version 4.16.6. which you should be able to get at the Limewire homepage.
Im using a brand new computer with Vista Ultimate and there is no reference to a file by that name (aopalliance.pack)
Also run your antivirus application. it's not likely but you may have picked up an infection somehow.
This is just a guess but I've had no problems after installing the new version.
Your downloaded file may have become faulty during the download.
I don't know where you got that 4.14 version but updating to 4.16 is worth a try. It can't hurt having the true new version anyhow.