icon slowing down the system

in trillian 3, there is an option in the preference menu to change your icon or to add other icons from your computer. I added a few, and those few must be too big because now whenever I load up the icon preferences my entire computer almost freezes and trillian does freeze. does anyone know where the buddy icons are stored so I can delete them? I looked in explorer and couldnt find them, and in the registry I couldnt even find the program trillian. if someone could please help I would be very thankful 🙂