Hi Roberto, first you should check if your browsers shortcut targets are not altered by this hijacker, you could follow this removal guide to help you out in this task (https://www.pcrisk.com/removal-guides/8149-istartsurf-com-redirect) - you have to locate the shortcut of your browser on your Desktop and click the right mouse button over it. In the opened menu, choose "Properties". In the opened window, locate the Target field and eliminate any text, which is entered after "C:\Program Files\Internet Explorer\iexplore.exe". Second I would scan my computer with AdwCleaner - https://toolslib.net/downloads/viewdownload/1-adwcleaner/ and SpyHunter (https://www.pcrisk.com/top-spyware-removers).