SonED2 is virtually impossible to crash, so I can't tell you what the problem is if it has to be anything to do with SonED2 rather than some actual system problem you're having that just happens to trigger when you're trying to use SonED2 (among other things). It wouldn't be the first time I've been blamed for things that turned out to have absolutely nothing to do with me, even involving SonED2.
What you'll have to do is tell me step-by-step EXACTLY what you did, and if you don't remember, you'll have to do it all again so you can know what to tell me. I have to know EXACTLY how you set up SonED2 (what folder you put it in, what files you put in that folder, what modifications you made to the setup), and EXACTLY how you set up Sonic 1 (where you put it, how you handled extracting the data, what modifications you made to that setup after extracting that data), anything else you did to the setup (any modifications you might have made to the project files or object def files, if you even opened them whatsoever in any kind of editor, whether or not you moved them, if they are all in the correct relative locations), a step-by-step walkthrough of EXACTLY what you did from the moment you turned on SonED2 to the moment it crashed, including what you did inside and outside SonED2, AND whatever else you had running at the time.
In fact, that's exactly what I want you to do. Start over from scratch, follow the instructions, and don't do anything "wierd". Describe to me EXACTLY what you did the first time around as I asked, and tell me the same things about THIS time, even if it works this time around