I have managed to find another solution wich works better Thanks to : http://en.wiki.mcneel.com/default.aspx/McN...sStringLiterals 'Unattended install in VBscript 'Script Created by juni 2009 Dim WshShell, fso, temp, sysd, app Set WshShell = WScript.CreateObject("WScript.Shell") Set fso = CreateObject("Scripting.FileSystemObject") temp = WshShell.ExpandEnvironmentStrings("%TEMP%") sysd = WshShell.ExpandEnvironmentStrings("%Systemdrive%") app = "\\<servername>\<setupdir>\" ins = "/s /f1""\\<servername>\<setupdir>\setup.iss"" " On Error Resume Next `Combine app 'setup.exe' with installation switch Wshshell.Run (app & "setup.exe " & ins) I hope this helps someone else