Trojan Zlob-X.a can appear in users display like fake System Alert Pop-up from rogue anti-spyware programs like IE Defender, Files Secure. Trojan Zlob-X.a is a backdoor Trojan, but rogue anti-spyware program developers thought that they can trick the users by using real Trojans name in fake System Alert Pop-up. Trojan Zlob-X.a popup they thought that showing this popup will scare and they will buy fake antispyware program. It may read:

“Your system is probably infected with latest version of Trojan.Zlob-X.a. Download antispyware software
Name: Defender-install.exe
Type:Application,2.69mb
From: iedefender”

Or

“Your system is probably infected with latest version of Trojan.Zlob-x.a Full system optimization will greatly increase your computers performance and prevent data loss. Click OK to download antispyware software (Recommended).”

Do Not download any rogue anti-spyware programs to fix this Trojan Zlob-X.a popup by their recommends. Most likely users computer system is really Not infected with Trojan Zlob-X.a, his system can be infected with fake anti-spyware or Trojan like Trojan Zlob that you need to remove.