Something obviously didn't go exactly as planned. It happens.
You can boot into the installed system using the same CD. At the second spot where it asks you to press "Enter", read the instructions towards the bottom of the screen. The syntax will be something like "linux root=/dev/hda1 ro". If you installed to, say /dev/hdb5, enter that instead, then press Enter.
If that gets you to the login prompt, log in as root and run "vliloconf" to try installing boot loader again.