Without knowing the exact model or your audio chip it's kinda hard to link to the exact file, but there are a few driver sites with links to Mecer drivers:
http://www.solvusoft.com/en/update/drivers/sound-card/mecer/models/
http://www.driverguide.com/driver/detail.php?driverid=961951
http://www.driversforfree.com/omn_dt/mecer/audio-and-sound/drivers.aspx
Mind - you may have to register and/or pay to download them.
Alternatively, if it's an onboard chip, visit the motherboard manufacturers website for drivers (or just to identify the chip).
Once you know what chip you've got, start with a Google search - I'm sure your not the first to need the drivers!