and selected this motherboard but nowhere can I find the sound drivers or the Ethernet Controller drivers, both of which are on the motherboard and not separate from it. I've tried runnning the VIAHyperion4in1448v drivers that I found at the Aopen website but they don't seem to include it.
Go to Strawballs' link and click the 'Advanced Search' button. Type AK77-400 in the Keyword box, Select Driver in the Category list then click Search. This will give you 3 pages of drivers that should be suitable.