Problems

I ran last known config and got nowhere.
Si, I ran Repair your Computer and got as far as the Recovery Options Screen

However when I enter CHKDSK /R in the Dos panel I get

Cannot lock current drive
Windowas cannot run disk checking on this volume because it is write protected

Then I tries SFC /SCANNOW

and got

beginning system scan. This process will take some time.

Thre is a system repair pending which requires reboot to complete. Restart Windows and run sfc again.

Well if I do I will be back here in the same place…

Maybe I am not entering the right text after

X:\windows\system32>CHKDSK /R

What shall I do now?

LATER

I changed directory to c:\ and got somewher

Chkdsk cannot run because the volume is in use by another process. Chkdsk may run if this volume is dismounted first. AL OPENED HANDLES TO THIS VOLUME WOULD THEN BE INVALID.
Would you like to force a dismoun on this voume (y/n)?

I pressed yes and the results include

0 large file records processed
0 bad file records processed
0 EA records processed
0 reparse records processed
334 index entries processed
0 unindexed files scanned
0 unindexed files recovered
256 file SDs/SIDs processed
40 data files processed
1160512 USN bytes processed
240 files processed (stage 4 of 5)
19035 free cluster processed

Free space verification is complete
Windows has chacked the file system and found no problems

102399 total disk space
22352 in 47 files
28 in 41 indexes
0 in bad sectors
3875 in use by the system
2048 occupies by the log file
76144 available on disk

4096 bytes in each allocation unit
255599 total allocation units on disk
19036 allocation units available on disk

failed to transfer logged messages to the vent log with status 50

AND LATER:

I used bcdedit | find “osdevice” which returned drive E: as the location of Windows

Now I was able to rum chkdsk which returned believable numbers, e.g. 524287999 kb total disk space

0 kb in bad sectors

I ran it again with the /f with the same results

I restarted but with nothing new happening