I have managed to find a solutions myself
Thanks to :
http://en.wiki.mcneel.com/default.as...StringLiterals
'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
Sandert