Double click on the exe you get from MS. It will extract some files into a folder on your C drive. Take note of this location as you will need to find it. After it extracts everything the update will begin to start. This is fine. Once it starts go to the folder the files were extracted to, and make a copy of it. It doesn't matter where, just as long as you do it before the update completes because the folder is temporary and it gets deleted after the update is done. Once you've copied the files you will need a program that can create ISOs. Nero burning rom can do this, among other programs. After making the iso, the file needed to run for installation is in the updates folder under the i386 folder and its called update.exe
TBH, I think you should just order the CD as it seems like its more trouble for you than its worth.
BTW you DON'T need an iso of SP2 to streamline a Win XP SP2 Disc.
I should know, I've followed the instructions in the link I gave you on the other thread and it worked fine.
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