This started happening shortly after Meltdown/Spectre was in the news. I've tried:
- Uninstalling and reinstalling IE.
- Resetting IE settings
- Uninstalling KB4056892.
Searching yields results for AMD processor PCs having boot problems, but I'm on an Intel and have no other noticeable symptoms. I'm on Win 10 Enterprise (1709 build 16299.125).