Spheris and I have experimented with the svcpack method of slipstreaming the hotfixes yesterday, and we did further tests to see if we could remove the actual downloaded hotfix files from the svcpack folder, since we have the extracted files in the i386 folder, and the cat files in the svcpack folder. Not doing so would have unnecessarily bloated the CD more. Advantages: 1. A true slipstreamed Windows XP SP1 CD with Pre-SP2 hotfixes. 2. The 13min stage in Windows XP Setup is bypassed quickly in 1-2 mins rather than waiting 5-20mins. Disadvantages: 1. Hotfix information isn't put into the registry, so Windows Update will incorrectly report you will need critical updates, even though they are already installed. This could lead to a lot of confusion on what you have and what you don't have when a new critical update is released. Unless we can find a way round this, I don't really know what to put into the Guide, either with downloaded hotfix files, or without?