Solution 1:

Do all of these steps in order from top to bottom and see if that helps:

  • Lower down your settings
  • Disable all the mods you have
  • Verify integrity of game cache (if you're on steam)
  • Load another save or start a new game
  • Uninstall the game completely and install it
  • Scan for viruses with your anti-virus program
  • Buy new computer specs

If you have tried all of these and have failed then im not sure what to do next.