I have the same Problem with Radeon 5770 and UE 4.9.2.
Yesterday i could work fine, today the launcher crashes with this message.
The newest Beta driver doesnt fix it here.
What I did so far:
reinstalled UE-Launcher and Engine 4.9.2,
deleted Temp Files and Derived Data,
clean removed Video Driver and installed newest AMD Beta Driver,
deleted Source, Binaries and Intermediate Files from Project and build it in Develepoment and Debug Mode with VS2013.
Any non-empty Project (and empty c++ project) crashes on editor-launch, but i can start a completly blank project.
this is a huge problem.