What application are you trying to install via advertisement? 1603 is a generic "fatal error" message for Windows Installer. Likely some kind of permissions issue. I have seen this pushing certain packages with SMS where the installer's internal script engine launches under the context of the interactive user instead of the "launching user". You could be having a similar problem if you are trying to install via elevated permissions. I would turn on verbose Windows Installer logging to see if you can get some more information. How to enable Windows Installer logging <http://support.microsoft.com/kb/223300> Regards, Jamie Nelson From: gptalk-bounce@xxxxxxxxxxxxx [mailto:gptalk-bounce@xxxxxxxxxxxxx] On Behalf Of Odiorne, Derek Sent: Wednesday, July 25, 2007 8:47 AM To: gptalk@xxxxxxxxxxxxx Subject: [gptalk] DoAdvertiseScript is returning: 1603 Hello, I am assigning a Group Policy Object to users in an OU but when installing from control panel I get A Fatal Error has occurred with DoAdvertiseScript is returning: 1603 in the msi.log file. Any ideas? The msi works fine running it manually.