blender startup issues

hello. a few mintues ago i went on belner and i have been having some problems. so recently i installed a addon called mmd to blender (because im a hatsune miku fan) and i went to open blender and as soon as it opened it crashed without even loading the ui. i thought it was the addon so i deleted it from the blender addons but still it crashes. can any one help me? btw i installed blender from steam because i was a noob with my computer i upgraded from xp to 8.1 and didnt know why it wasnt popping up. should i delete the steam version and download it from the offical site? ok thanks! bye