Hello @Sakti, Welcome! Which software are you trying to install? Is the Hosts file original? Is Windows defender active? Before installing Kaspersky Total Security (KTS), was a check whether any applications installed on your computer are incompatible with Kaspersky Total Security done? Which KTS version & patch(x) is installed? Please let us know? Thank you🙏 Flood🐳 +🐋 (x) = letter Helo sir, thanks for reply on me. Web.Developer Pro Host file still origfinal, and i can change using sublime text, so there is no problem. No, Only kaspersky active. Yes, i install all component on KTS. patch installed on my drive C Thanks advanced