MikeF, pending your OS, did you try your virus scanner and or running Malwarebytes in safe mode? Make sure the virus scanner and malware removal apps are up to date. Then startup in safe mode and scan without Internet connection.
Some spyware / malware will have its hooks in the systems startup and cannot be removed thoroughly unless the bare minimum drivers, and or DLL's are loaded.
Malwarebytes used to do a good job, but have not used lately. Often times we had to boot up in safe mode and scan. Sometimes had to use more than one removal app. Then reboot and rescan in safe mode again for good measure. Only boot up normal once it scanned clean or showed zero threats remained.
Another option is try restoring to a known good startup point. Lastly reloading and restoring the system if needed.
Recommend if you have not already done it, back up your data especially before altering the systems startup. Thanks, Doug.
Edited by Halo1st
06/26/2018 1:43 pm