OS X V10.5 Leopard :: Remove Autorun.exe (W32/SillyFDC-DU | Trojan.Win32.Agent.aec)?

Apparently my mac is holding a Windows Trojan. It probably got on my mac through a USB device when uploading things to desktop.The file itself hasn't been touched since 2006...pretty darn old usb/trojan.  I have both Kaspersky Anti-Virus and Sophos (installed after Kaspersky was unable to disenfect) which apparently quarantined the file but can not be deleted.The file autorun.exe is hidden in a folder RECYCLER in the desktop. I've used the Terminal to show the file. I've checked its info and it's already unlocked and privilege is Read & Write.  Whenever I throw the whole folder into the trash and attempt to empty, I receive error message "The operation can’t be completed because you don’t have permission to access some of the items." If I drag the file seperate from folder into the trash, I receive the prompt to enter my security question (was never prompted this for any other file). After entering password, it makes the sound that something went it. The Trash however is empty, and the file remains in the RECYCLER folder in the desktop.  

Info:
Mac OS X (10.6.8)