WSH:
Код:

Option Explicit
Dim dtConditionDate
Dim strPath
dtConditionDate = CDate("01.01.2015 15:00")
strPath = "1.exe"
If Now() >= dtConditionDate Then
If WScript.CreateObject("Scripting.FileSystemObject").FileExists(strPath) Then
WScript.CreateObject("WScript.Shell").Run """" & strPath & """"
Else
WScript.Echo "File [" & strPath & "] not found."
WScript.Quit 1
End If
End If
WScript.Quit 0