Can't boot with install disk

I ran out of disk space on the Mac HD and I only have 452 MB left. Before, I had 12 GB. I think trying to connect a router swallowed up the GB.
Anyway, because I ran out of disk space, I had trouble starting the Mac HD.
I can open Bootcamp (XP Professional) and have no problem there.
I attached the dvd drive to the MacBook Air and put the Snow Leopard Install disc inside and tried
1) Option start
2) Pressing C key start
3) Option command shift delete start but none of them work.
I cannot get it to boot with the Snow Leopard install disc.
What can I do?
I was planning to do a clean install but can't boot with the Snow Leopard install disc.
Can I do it from Bootcamp?

I booted with the Snow Leopard Install disk and checked Disk Utility and found that the HD disk was corrupted. This time it showed only 77MB free space even though I freed up 2 GB using 'rm' commands in single-user mode.
The problem was some kind of virus or something that not only ate up free space but corrupted the system.
I had to do a clean install (erasing the Mac HD volume and formatting it) to get the Mac HD operational again.

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