A. If after you remove the 3rd setup disk from the machine and reboot a blue screen is displayed:

Setup has encountered a fatal error that prevents it from continuing. Contact your software representative for help. Status code (-x4, 0, 0, 0)

This indicates a virus in the Master Boot Record of the disk (this affects NTFS as well as FAT). Use an anti-virus product to clear the MBR and proceed with installation.