Win 10 Endless boat?

I installed Sophos Home, ran a scan that removed a few files, and then restarted the notebook.
Now I can't get beyond the charging circuit at system startup. I get into System Restore and can run Secure Boot.

I tried a few things to get it back, but I can't do it. I can't use a restore point. As an error, I usually get that wdboot.sys can't be extracted, or something like that. Command line options like "bootrec / fixboot", "sfc / scannow" or "chkdsk / f / r" fail or can't fix the errors. The jump start also brings nothing.
I already disabled Sophos in the Secure Boot and removed it from the autostart. Uninstallation stops after a short time.
I have not tried third-party software.

I have not tried to reset Windows completely yet. Of course I would like to keep my data. There's also an option when resetting that user data is not deleted. But how far is that possible? Depending on the app, one or the other of personal data will probably be lost.

Is there any way to repair the system without losing data?

Did you have another hard drive connected to the Windows installation? On my server it was like this: The boot sector was written on the HDD and the other stuff on the SSD.

Thus, I could only boot when the other plate was connected…

In the end, it has me then messed up the whole installation…

Reboot Bootsector you have indeed made anscheindend already.

Check with Diskpart as your partitions are divided.

Unfortunately I do not know any further.

Is everything on an HDD. I can also access everything via Secure Boot. In principle, therefore, should be possible to get it right again, in my view.
I have also removed everything from accessories in front of the boat.

Sophos managed to "uninstall" with a batch script from Sophos, but I still see the files and even processes are running in Task Manager.

But anyway, I could boot again afterwards, so that the main problem has been fixed.