It's broken

It keeps crashing and I have no idea how to fix it and it has started to crash everytime I use it. The only solution was to install the newest patch for the engine . This has lead to the lighting in my level being messed up and so I'll have to re-work due to some changes between the 2 versions. Luckily the lighting was still a W.I.P so it wasn't a huge problem but time consuming non the less. This is a screen shot of the previous level crashing on me and all that it was showing me!!! So annoyed I hate technology sometimes......