If the soundblaster card is a full card with the small speaker plugs. Go into the bios under onboard devices turn off the onboard sound chipset.
Save and exit the bios. Boot into widows then go to intel and install the intel chipset update to install the drivers needed for the pci bridge. If you have a amd chipset mb download the newest amd chipset. Once installed reboot and see on reboot if your sound card is found. If not go under device manager and see if anything is installed under sound device or if there any yellow !!!! If there are try installing the newest beta driver from soundblaster for your sound card.