typical sunOS .. the bootstrap is unable to read from the CDROM drive, and cannot mount the "root" filesystem from the CDROM.
OK on cd 2 you'll find the floppy disk configuration image called d1_image under solaris_9/tools/. You will need to download dd.exe from
http://www.nu2.nu/bootcd/#aboutdd. Run dd in cmd window from cd folder /solaris_9/tools type:
dd d1_image a:
thats it -- reboot with this floppy + install cd and your in..