So I have gotten to the point of the main quests where you have to travel to Karthspire for the quest Alduin's Wall. Upon traveling to Karthspire and defeating the Forsworn there, I attempt to enter the cave at Karthspire. Upon entering the game loads, stops, loads, stops, loads, stops, loads AGAIN, stops AGAIN, and then spawns me back outside the cave. I have tried everything I know to fix this to no avail. I have tried disabling and re-enabling mods, going back to previous saves, restarting the game, etc. Even worse I have looked it up and found NOTHING on the internet with any similar problems. If anyone has experienced this and knows how to fix this please let me know. I would like to get on with the main quests.

Unless you have disabled all mods and then started a new game without them, I would wager that a mod is causing this. Every previous game save that had mods installed when you made it is now infected with their influence, and so disabling mods has no real effect unless you also have a save that was made before any mods were installed, or start a whole new game.