Constant Reboot after software update

I just performed Software Update on my Leopard MacBook Pro and now it's in a constant reboot cycle. The grey boot up screen displays for 90 secs or so and then reboots and the cycle repeats. There were three programs for update but the only two I remember were iTunes & Front Row. How do I recover? Thanks.
Kevin

Just to add some more detail to the issue:
I've reset the NVRAM by holding down the Option/Control - PR at bootup and it seemed to work in that it then rebooted again. But nothing else but the continuing reboot cycle.
Next I tried to get into Safe mode by holding down the Shift key on bootup but this did not work. I inserted the Leopard DVD on bootup but it just spins.
Help!!!
Kevin

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