Finally I fixed TROJ.AGENT.HGUPN!C virus! Use TROJ.AGENT.HGUPN!C Manual Removal Guide
It was nightmare! TROJ.AGENT.HGUPN!C virus hijacked my PC! I wrote this post to show you how to remove (uninstall& cleanup) TROJ.AGENT.HGUPN!C from your system and from browsers: Chrome, Mozilla Firefox, Internet Explorer, Microsoft Edge.