Over time RL loses stability. If you have SL for more than six months, at some point you’re going to have to reinstall RL from scratch. Contrary to popular belief you won’t have to reformat your RL.
Back up your RL just to be safe. If everything goes smoothly you can reinstall RL by clicking the top right corner X or by keying ALT+4.
What do I do if I have a blue screen?