Go to the Asus website, support and drivers area: http://support.asus.com/download/options.aspx?SLanguage=en&type=1
You will need to know the full model number of the motherboard, or use the
"Model Automatic Detection
" utility on the above page,
Or enter the board's Serial Number
into the appropriate box.
If they don't have any Vista drivers for your board, it's fairly safe to assume that they don't exist.