Hello everyone,
after an automated Windows update the Lenovo B50-70 Notebook of my wife ended up not booting anymore and displaying the error code 0xC000021A. After some Google search I got into the recovery mode and tried without luck all proposed repair solutions in following order:
1. Automatic repair in troubleshoot / advanced options.
2. loading of all restore points.
3. loading windows in safe mode with disabled driver signature enforcement.
4. Fdisk went thru without errors.
5. Dism and sfc failed due to /online parameter which could not be executed from Windows PE environment.
6. Reset Windows was aborted for some reason.
7. Get back to previous build also. . .
I already excluded Memory and HardDrive errors as you can read in this Forum
HERE.
Then I removed the disk and intedgrated it into my desktop in order to save important data.
After that I found in another forum another proposal. So I loaded the command prompt and tried dism not with the /online but with the /image parameter and in the log there was a checksum difference for Difxapi.dll. I also got SFC running with
sfc /scannow /offbootdir=d:\ /offwindir=d:\windows and got more or less the same result. After a lot of help in the forum above I got the Difxapi.dll replaced by a good one, and SFC and DISM went thru without errors (see CBS.log attached). However Windows will still not boot.
After a FRST64 test
sofwaremaniac asked me to open a new thread here.
