Which browser are you using. Have you rebooted?
Sorry have to ask.
Maybe try installing a different browser just to get online so you can download a good antivirus or malwarebyte's spyware scanner or something.
If your takin' your girlfriend out tonight
You better park the car well out of sight
'Cos if they catch you in the back seat trying to pick her locks
They're gonna send you back to mother in a cardboard box !