HpUI.exe is a malicious process related to several browser hijackers. Istart123 is one of them. This file is a component of Sup Tab PUP (potentially unwanted program), which is installed together with Istart123 virus. HpUI.exe is the process responsible for maintenance of Search Protect – another malicious utility that is made by hackers to prevent users from removing Istart123 hijacker. In this guide we will explain to you how to get rid of HpUI.exe from your computer.