Ok didn't see that post. Is the sony a sound card, are you saying you changed some hardware? Btw, when you did try to boot up what happened, did it just boot to windows, because it's possible you do not have your pc bios set to boot from cd first, most likely it's set to boot to hd first and therefore you wouldn't know.
Do you know how to go into the pc bios and make changes. Usually just hit delete button just as the computer boots up and you will be presented with a setup screen. Usually in a section called 'advanced setup' is where you can change the boot order. Change it to boot from floppy first, cd second and your hd third. In any event, just make sure the cd is set to boot before the hardrive.