Maybe you should go back and re-trace your steps, and make sure you're re-locating your objects into the correct folder. You mentioned something about duplicate particals? You should probably delete anything that ends in _0, _1, _2 etc. Maybe you could screenshot the folders you placed things in, so us veiwers could have a better view and better chanse at picking out/spotting any possible issues.
Yep, i've already checked for duplicates. There's none there.
it's something in the My_Objects folder that makes the game crash, but I can't seem to find what it is.
I'll make screenshots real quick, even though there's 2356 things in the folder. :')