unable to install v10.3 on my B&W

i'm still stuck trying to install v10.3 on my b&w...when i start up w/the v10.3 #1 disc my start up screen freezes after about 15 sec.(gray screen w/apple and spinning wheel).
i'm using a copy that i made from my apple os disks. i have a build of 6R73. back in may it was suggested that i update my firmware...i tried that too, but when i unzipped the DL folder it was empty, also the mac updater said that there are no futher available updates for me.....any thoughts

B & W Mac OS X (10.2.x)