Try this, Download and update Superantispyware, free version. sas . On installing don't let it protect your homepage just yet, you can change the setting later.
In safe mode check in programs and features for any unknown toolbars and delete. Still in safe mode run a full SAS scan then delete all it finds. In SAS go to preferences, Hi-Jack Protection tab and type Google's url or whatever the url was for your original homepage. Tick the first two boxes.
Reboot to normal mode and run Malwarebytes. MBAM free.
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