Do you know what Trojan.KillAV is?
Trojan.KillAV is a Trojan that will open security holes on a user's computer. Trojan.KillAV is a threat to the security of your personal information stored on your computer. Trojan.KillAV may log and monitor your internet activity and use your computer to transmit spam emails to other internet users. Trojan.KillAV may also disable any antivirus software running on your computer.
In non-techie terms: Distributors of Trojans conduct illicit installation methods to extort money from you. Be careful when you remove Trojan.KillAV because even some anti-spyware programs can have a hard time removing it. If the anti-spyware program that you're currently using is not able to remove Trojan.KillAV, try SmitFraudFix for free and let me know if it worked you.