When you try to create a Wizard disk using the Files and Settings Transfer Wizard, the option Create a wizard disk in the following drive may be grayed out.

This happens if the system has no floppy drive attached, and no other removable drives are present. Please note that the Files and Settings Transfer wizard does not allow saving the Wizard files directory to CD media. To workaround the problem, you may try one of these options:
The Wizard disk contains the two files Fastwiz.exe and migwiz.cab. The migwiz.cab is a compressed file, which contains the support files required by the Files and Settings Transfer Wizard. The Wizard files should not occupy more than ~1.2MB of disk space. The Wizard actually gathers the supporting files from the following locations of a Windows XP system, and stores them to a removable disk: