Forum Discussion
Explorer crash - ucrtbase.dll
The event shows that sihost.exe, rather than File Explorer itself, terminated while calling ucrtbase.dll with exception 0xc0000409. That identifies the crash location, but it does not prove ucrtbase.dll is the root cause. System-file corruption or a background software conflict still needs to be tested. Since DISM and CHKDSK have already completed, install all Windows updates, including any offered Lenovo driver updates, restart, then run an elevated Command Prompt and execute sfc /scannow. Note whether SFC repairs anything. If the crash returns, perform a clean boot by hiding Microsoft services, disabling the remaining services and startup apps, and testing normally. Re-enable items in groups to isolate the conflict. If it still crashes in a clean boot, press Win+F after the next occurrence and submit Feedback Hub diagnostics with the Event Viewer entry and report ID. Avoid replacing ucrtbase.dll manually; use Get Help or Microsoft Support if SFC cannot repair files.
This is exactly the type of response that I specifically mentioned:
NOTE: Please DO NOT post genaric suggestions such as
- run DISM (Deployment Image Servicing and Management)
- run Check Disk (CHKDSK)
- Make sure drivers are up to date
- etc...
- add to the list Feedback Hub diagnostic,s Get Help, or Microsoft Support
These types of responses are NEVER helpfull.
The question is WHAT would cause this type of crash. sihost.exe is effectively explorer in this case. Explorer goes blank and comes back, for no reason.
