If I have download lots of furniture and one of them is kicking me out of the game, how do I find out which item is kicking me out so I can delete it?

Look through all of the mods you have downloaded since the game last worked properly. Create a copy of them all in another folder, then delete them all from the mods folder and restart the game. If it runs OK, then exit and slowly re-add the mods back in batches of five to ten. Open the game with each batch you add; if it works, move onto the next batch. If not, then it is one of these that is the problem. Remove that batch from the mods folder and then repeat the above process with each mod individually. Delete the one that causes the crash.