Hi, my name is Jose. I'm an Independent Advisor and a Windows user like you. I'll be glad to help you today.
Most malware makes modifications to the operating system, either to hide, spread, open back doors, etc.
The first thing we are going to do is check that there is no remnant.
https://docs.microsoft.com/en-us/windows/securi...
After that, let's check for missing or corrupted file.
https://support.microsoft.com/en-us/help/929833...
Please let me know if you need any further assistance.