Thank you both. when I'm trying it from the command line (on VMWare - after it didn't install) it works fine with the same RunOnceEx. when it's on the first installation - it just doesn't install it. no error reported. the files are extracted but setup doesn't run and the runOnceEx continues... Cluberti, I've received an error about the "OutlookS" parameter, any idea why could it be? could you explain about those parameters a bit? And last thing, is there a way to test it without running through the whole installation? (when I've tried to run only the RunOnceEx from windows it worked fine...) Many Thanks!