|I think you should scan your computer with Malwarebytes in Safe Mode. Malwarebytes must be updated.|
You can also optimize internet explorer.
Open internet explorer > tools > internet option.
In general tab, delete all files, cookies, history.
In content tab, clear SSL.
In security tab, set as default
In advanced tab, restore as default. And Uncheck or remove tick mark from "Enable third party extension browser."