major dll problem

Any help would be greatly appreciated. There is a program which searches for unused dll files and lets you discard them. I used the program, then lost it. I have a file of the "unused files", but can't find out their original location, in other words, can't replace them. My problem is that I can't load any logos any more on my internet pages. Does anyone know: a) the program I'm referring to or :( how to find the original location of a dll file, so it can be replaced. pr c) which dll file gives you the ability to load logos/pictures. ANY help would be great. Thanks. Greg.