@mara- Hmmm....I thought that was the case. Just a suggestion for you: Please add in very clear terms and very obvious text in your original (first page) post that your slipstreamer ONLY works with the Enterprise Edition (i.e. Volume License) version since that is the only version that supports running an Admin Install. Currently, there is nothing in your explanations that clearly indicates that other versions (i.e. retail versions) do not work. I noted in my original post that I had tried both the Pro and Std versions of O2K3 and that those did not work...which was a hint that the Enterprise Edition was probably all that was supported. MS literature notes that Admin installs are supported only on the Enterprise version. However...there is a technique which requires using "Orca" to edit the PRO11N.msi, or STD11N.msi, or other the relevant .msi to change certain switches such that admin installs can be performed. There are also some other techniques for slipstreaming SPs and hotfixes - you can find them here on MSFN. But, all of these are somewhat "messy" and require manual extractions and/or individual integrations. If you read through the forum posts you may be able to find a methodology to employ in your slipstreamer. For now apparently, the slipstreamer is only useful to those folks who have the Volume License Enterprise Edition. Thanks for replying to my posts.