Indeed the restore CD should bring the machine into the original state, with everything working. If it doesn't, it might be a hardware problem or a BIOS settings problem.
There should be no need to install the Soundblaster card drivers, unless that card was installed later, because it won't be supported by the original configuration, of course.
So it's not clear what you do and why you do it. Without knowing anything more, I can only advice to delete all the soundcard devices from Device Manager, and then let Windows detect the 'new' device when rebooting. That's generally a good way to install drivers, although it's still better to do it per the original installation instructions.
Hope this helps.