Unreal Engine 4/18.0 won't launch

So I was using UE16 yesterday, and in the middle of me fiddling with blueprints the editor just crashes (closes out). So i try to reopen the editor, and it gets stuck at 45% then brings back a crash report. I uninstalled and reinstalled the editor since i thought maybe because i had the outdated version it was crashing. so i update the engine and the problem was still there. I decided to completely uninstall epic games and unreal engine and reinstall, but still the same problem. How can I fix this problem? (It wasn’t my first time using the engine. I’ve had it and used it for a couple of months, and 2 days before yesterday it was working completely fine.) I really want to continue on my project, but I can’t if this keeps happening.