How are you trying to install it?

If the cd is in there when you start up the comp, you shouls be able to go into the options thing... On my comps it usually says something during the boot like "push f10 to open configuration menu" or something like that. Then in there there should be an option to do with booting, and you need to change the boot drive from whatever it is to the cd drive the install cd is in... That, or there may be a boot from CD option.

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