If the registry is infected, the malware may have a separate file to monitor if the victim computer is still infected and that will reinfect it if not.
ClamWin (using the Clam AV scan engine and signatures) can only quarantine or remove infected files, as you choose in the Infected File Option in the Tools, Preferences, General menu. It can only quarantine/remove files. I do not believe it can remove registry entries--some AVs do not.
If you are not using a real-time AV along with ClamWin (you should be--because ClamWin is not a real-time scanner but scans "on demand" after you get an infected file), download Malwarebytes free from
https://www.malwarebytes.com/ and do a scan with it. Also download Microsoft's free Safety Scanner (MSERT) from
https://www.microsoft.com/security/scanner/en-us/default.aspx and do a scan with it. Be sure and scan with Malwarebytes first and then with MSERT. Get back here with results.
Regards,