Why so many worries, just use Free antivirus tools. Many years, use CureIt, from Cd -> Dvd -> Flash.
https://free.drweb.ru/download+cureit+free/
ftp://ftp.drweb.com/pub/drweb/cureit/cureit.exe
Kaspersky Virus Removal Tool
https://www.kaspersky.ru/downloads/free-virus-removal-tool?ysclid=mjviudgnex23020704
If, you still worry, just install Full version, any Antivirus, you get 30 days free, for test.
https://www.av-test.org/en/
P.S If, you have Virus, (more important Troyan) , they can ease change, file name, regname. If, they already inside.