Please try these options one by one and check after each option
1: Run SFC Scan & DISM - You seem to have already done it.
How to - https://answers.microsoft.com/en-us/windows/for...
- Run malware scan
Malware Bytes - https://www.malwarebytes.com/
- Use Defender / ESET Scan - Part of it, you may have already done.
a. Open Windows Defender > Virus & threat protection menu > Advanced Scan > Full Scan
b. Download ESET / Sysrescue and follow the instructions on the link - https://www.eset.com/us/download/tools-and-util...
Disclaimer 1 - Using Third Party Software is completely at your own risk. This advice is in my personal capacity as a volunteer.
Disclaimer 2 - This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.