My Trojan Remover Quick Scan says that there is a registry entry that loads SDWinLogon.dll but the file cannot be found (it says it may be hidden).

The registry entry in question is: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\WinLogon\Notify\SDWinLogon.

I am using version Search & Destroy version - build 20120704.

Do I delete the registry entry or is this a hidden file and I should leave the registry entry as is?

A printscreen of the alert is attached.