If it is restarting in the bios, then I doubt it is the soundcard. It would need booting to windows to load the drivers.
You could physically remove the card and if you can get it to boot to windows and remove it from device manager.
The fact that it is rebooting, even when you are trying to access the bios, makes me think it may be something else.
Psu, memory or overheating cpu would be my first thoughts.
To see if the psu is under to much load, with the new soundcard added. Take out the sound card and unplug any slave hard drives and cdrom's. See if it still reboots.