I haven't used Webroot in probably 6 or 8 years, but I know they used to be good, and I haven't heard anything to the contrary. I see they have several different products and you didn't say which one you have or what version of Windows you have either. In any event I'd download the free version of MalwareBytes and run both it and your antivirus in Safe Mode. Some viruses can hide in normal mode, and there's malware that your antivirus can miss.
I have no knowledge of virus and malware diagnosis or removal. Can anyone tell me how reliable Webroot is? I have it installed and it claims my pc is clear, but I have had some unusual problems. Any advice on the reliability of Webroot would be appreciated. Thanks in advance. Mike Buckamneer