@puzzlezaddict First of all thanks so much for the help.
I'll try the first 2 options later because i'm working right now, and post the results here.
About the 3 one, here are the outcome:
Windows PowerShell
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PS C:\WINDOWS\system32> DISM.exe /Online /Cleanup-image /Restorehealth
Deployment Image Servicing and Management tool
Version: 10.0.18362.1
Image Version: 10.0.18362.535
[==========================100.0%==========================] The restore operation completed successfully.
The operation completed successfully.
PS C:\WINDOWS\system32>
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Windows PowerShell
Copyright (C) Microsoft Corporation. All rights reserved.
Try the new cross-platform PowerShell https://aka.ms/pscore6
PS C:\WINDOWS\system32> sfc /scannow
Beginning system scan. This process will take some time.
Beginning verification phase of system scan.
Verification 100% complete.
Windows Resource Protection did not find any integrity violations.
PS C:\WINDOWS\system32>