Why would you put the CD in the drive in the first place. But installing the pack you are intentionally trying to overwrite system files. No doubt the installer is smart enough to stop you and make you take out the CD, because if it were there, and Windows File Protection were active, then it would overwrite the Visual Transformation Pack and make the installer moot. However, when making an nLite CD, the default option is to disable Windows File Protection. I'm not sure how much of an issue any of this is. Either way, I'm holding out for a version of the pack (hopefully the next one) that can be properly slipstreamed.