Open Task Manager and close all its processes. Then go to control panel and uninstall it. Look for Yahoo Search and Ask Toolbar while you're there and remove them the same way. Then download and run Malwarebytes.
Open the Start menu.
Click Settings.
Click System on the Settings menu.
Select Apps & features from the left pane. ...
Select an app you wish to uninstall.
Click the Uninstall button that appears.