The CPU you use is a HT and this feature is enabled in the BIOS So linux sees the machine as having two CPU and has installed two kernels one is the normal kernel that is ment for a single CPU system and the SMP based kernel which runs on multiple CPU machines Thus the two entries in the boot screen. You should use the SMP kernel for normal use and to remove the other entry open /boot/grub/grub.conf and remove the entry for the other kernel.
Regarding smartd I think you have a sata disk and smartd is not supported on a sata disk
This has nothing to do with sound try reinstalling alsa to get the sound working.
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