Are you just using a commandline script or do you want to use kixtart? Also, what version of kixtart would you use? (you can run it from your netlogon share.) Also, what client/server OSes are you using?
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I currently have a script that does exactly what you want for Win 9x (cuz i do the IE updates through logon script) ... but I'd have to trim it down so it would be usable for you.

Brian