winlogon.exe error

"Winlogon.exe is infected with a Trojan on my PC. How I can fix this problem?

Hello, my virtual friends? kaspersky antivirus 5.0 Professional is installed on my computer, the antivirus software detected a trojan on my computer, but can not delete or disinfect that trojan on my computer. After this, wanted to install the new version of Kaspersky Anti-Virus 6.0, but after restarting the computer, Kaspersky can not be installed at the end of software, and gives me this message: "Installation failed because an error occurred." And now The files infected by the Trojan "(Reported by Kaspersky Antivirus 5.0): 1: 2 winlogon.exe C: \ WINDOWS \ system32 \ i download this ld100.tmp has the file: "C: \ WINDOWS \ system32 ld100.tmp" on the web, maybe help me solve my problem occurred in my computer.Address this file: "Http: / / www.sharemation.com/ newgoldenman/ld100.rar? Uniq =- hdhz89" My operating system is Microsoft Windows XP SP2, and my team is Sony VAIO VGN-FS740 / W God bless you to help me and solve my problem. Ali Noorian

Hello, unfortunately you have been infected by the Trojan "Ask System. "Here are some details about winlogon.exe:% http://spywarefiles.prevx.com/RRHDIG2178/winlogon 252Eexe.html The best and easiest way to eliminate this infection is to install the trial version of Prevx1. It scans your PC and removes this and other infections free of charge.

How about winlogon.exe