Minecraft Crashes as trying to load a modded world?

Make sure you're on your profile with All of the mods that world has first. If that isn't the issue, it might be your specs. If it's not that, it might be one of your mods. If you're given a crash log, have someone analyze it.

Maybe your computer is not compatible with that mod

You probably installed it wrong. You should delete the update and install it again, BUT all your mods will probably be gone (i'm not sure though).

Or go to your mods folder and delete the mod (game mod) or save (modded world).