Hi Koesuma, Have you gone through the settings in your browsers about home page, search engines and other places where Web Companion can be configured? If that doesn't help, let us see what's going on in your computer and how to remove Web Companion. Please, download Farbar Recovery Scan Tool (FRST) and save it on the desktop: https://www.bleepingcomputer.com/download/farbar-recovery-scan-tool/  Double click FRST file to run the tool. Read the disclaimer and click Yes to acce