MS 6340? Who makes it, have you gone to their website for drivers, assuming you don't have the cd that came with it? No need to flash anything, you'll just risk a dead mainboard. You simply need to install the drivers.
By the way, does the device appear in device manager, even if its listed with a yellow exclamation mark? If not, make sure its enabled in the CMOS setup. If it is, then yes, just need to find the drivers.
Matt J.
Please always take the time to backup any and all data before performing any actions suggested for ANY problem, regardless of how minor a change it might seem. Also test the backup to make sure it is intact.