A possibility is that the linux kernel used to drop the installation on your hardware is having difficulty with some incompatibility with your floppy hardware. Go into your BIOS and disable the floppy subsystem completely. Then boot again. You won't need your floppy drive, but if for some reason you do, once it is installed you can always go back into BIOS and re-enable it.
The other possibility that springs to mind is the install image is corrupted - this can cause a range of weird errors - there are two places where corruptions can come from:
1) During the download if you didn't use the torrent to download the image. Either use the torrent, and/or use the md5sum to confirm the integrity of the image once downloaded.
2) During the burn - it is critical that you burn your installation DVD using your burner's slowest possible speed. Re-burn your DVD.