trying to make a fresh installation BUT getting nowhere !

hi there, been having issues with my pc lately and have noticed many things are not working, e.g can not use troubleshooter and messages popping up every day telling me this build of windows will expire on 31 july 2020 ..... and the p,c itself is running very slow, so i decided to reset my pc BUT i get the message ' required files are not trusted the files cert. may have expired or the files modified by others'. years ago i seemed to have system restore points but now i have none . any help would be greatly appreciated .... cheers p.s my laptop is a qosmio toshiba G50.... 64 bit .... and using windows 10 pro insider preview ... evaluation copy build 19624 rs pre release 200502-1339. i should move to a new build asap,,, but not getting any windows updates

Open the Command Prompt by typing cmd.exe into Start Menu, right-click on Cmd.exe, and open it as an administrator.

Execute below commands one at a time.

Code:

Sfc  /Scannow

Dism /online  /cleanup-image /restorehealth

The above commands scans integrity of all protected Windows system files and repairs files with problems when possible.

ok thanks,,,,will give it a go

- - - Updated - - -

hi there,,, ive completed the tasks but no change at all .... cannot refresh in settings , cannot access troubleshooter , still getting the message that this build will expire in 31 july 2020 , and also getting messages that i,m running low on disc space even though when i click on this PC it says on my c drive trhat there is 25 GB storage available

C:\Users\Neil>chkdsk /f C:
The type of the file system is NTFS.
Cannot lock current drive.

hi there , i tried but i got this .......Chkdsk cannot run because the volume is in use by another
process. Would you like to schedule this volume to be
checked the next time the system restarts? (Y/N)

- - - Updated - - -

Microsoft Windows [Version 10.0.19624.1000]
(c) 2020 Microsoft Corporation. All rights reserved.

C:\Users\Neil>chkdsk
The type of the file system is NTFS.

WARNING! /F parameter not specified.
Running CHKDSK in read-only mode.

Stage 1: Examining basic file system structure ...
548352 file records processed.
File verification completed.
Phase duration (File record verification): 36.60 seconds.
6501 large file records processed.
Phase duration (Orphan file record recovery): 0.00 milliseconds.
0 bad file records processed.
Phase duration (Bad file record checking): 0.42 milliseconds.

Stage 2: Examining file name linkage ...
782 reparse records processed.
637798 index entries processed.
Index verification completed.
Phase duration (Index verification): 2.18 minutes.
0 unindexed files scanned.
Phase duration (Orphan reconnection): 1.01 seconds.
0 unindexed files recovered to lost and found.
Phase duration (Orphan recovery to lost and found): 0.48 milliseconds.
782 reparse records processed.
Phase duration (Reparse point and Object ID verification): 35.51 milliseconds.

Stage 3: Examining security descriptors ...
Security descriptor verification completed.
Phase duration (Security descriptor verification): 409.32 milliseconds.
44724 data files processed.
Phase duration (Data attribute verification): 0.43 milliseconds.
CHKDSK is verifying Usn Journal...
37733864 USN bytes processed.
Usn Journal verification completed.
Phase duration (USN journal verification): 1.72 seconds.

Windows has scanned the file system and found no problems.
No further action is required.

121127230 KB total disk space.
94959536 KB in 228980 files.
142616 KB in 44725 indexes.
0 KB in bad sectors.
659722 KB in use by the system.
65536 KB occupied by the log file.
25365356 KB available on disk.

4096 bytes in each allocation unit.
30281807 total allocation units on disk.
6341339 allocation units available on disk.
Total duration: 2.84 minutes (170917 ms).

C:\Users\Neil>chkdsk

sfcdetails.txt

- - - Updated - - -

Microsoft Windows [Version 10.0.19624.1000]
(c) 2020 Microsoft Corporation. All rights reserved.

C:\Users\Neil>DISM /Online /Cleanup-Image /CheckHealth

Deployment Image Servicing and Management tool
Version: 10.0.19624.1000

Image Version: 10.0.19624.1000

No component store corruption detected.
The operation completed successfully.

C:\Users\Neil>