• Remove Trojan.Agent Master Boot Record infection with Kaspersky TDSSKiller
• Remove Trojan.Agent virus with Malwarebytes Anti-Malware Free
• Remove Trojan.Agent trojan with RogueKiller
• Remove Trojan.Agent infection with HitmanPro
• Double check for any left over infections with Emsisoft Emergency Kit
• Remove Trojan.Agent adware with AdwCleaner

http://malwaretips.com/blogs/trojan-agent-removal/