I have been using mod loader for ages now, using mo creatures on my minecraft, however, when i deleted my bin so i could start fresh and install the planes mod it didnt work, i checked over every mod needed for it to work, deleted several bins, but overall, having the whole game vanilla, I installed mod loader by itself, and after I log in, it crashes a few seconds later, i have installed the latest version, any help?
Try Backing up your save or whatever, and completely deleting your minecraft file (Search %appadta%) Then create a new minecraft folder (via starting a new world, and then try to instal the mod again, thats what i have to do sometimes, you could also use Mod Manager.