Thanks for all your help! Everything appears to be working normally now. Attached is the OTL log, and thanks again for your instructions!
Specifically, something called Gen.Variant.Kazy. I've noticed that I cannot use iTunes or Windows Defender updates - those programs cannot login, though my browser works, as does anything else that connects to the internet. The malware all seems to be located in the Windows Defender folder. Enclosed are the logs, which I hope will help... Thanks for any help you can give me!