Upgrade to 10.6.3 unsuccessful.
I'm on 10.5.8 and bought the 10.6.3 disc to upgrade to snow leopard. Inserted the disc and followed instructions. It said it was installing. I walked away and when I returned the login screen was displaying. I logged in but noted that the version number is still on 10.5.8. I see the install data folder with today's date and a log file, etc. Now when I try to reinsert the disc, it ejects. Please assist.
iMac, Mac OS X (10.6.3)