These were the main bad boys

C:\Windows\tasks\At2.job
C:\Users\Pete\AppData\Local\BthHelpaudio\SystemAuthenticationCtrl.dll

Variants of a trojan downloader - they were helped by a proxy within IE

HKEY_USERS\S-1-5-21-447438009-1717116898-3675535531-1008: “ProxyServer” → http=127.0.0.1:49939

The server was probably taken down, but no doubt it will reappear in another guise

Could you now run a Malwarebytes quick scan and post the log please as sometimes when I remove something other files are revealed… Also how is your computer behaving now ?