I have the same board and although i havent had the same problems, (as i have a platinum live) there is a note on abits site concerning issues with the sb live series, and it is supposesly resolved in the latest bios update, and by changing the PCI timeout i believe, see this link

<a href="http://www.abit.com.tw/eng/product/mb/kt7a-raid.htm" target="_blank">kt7a raid homepage</a> and then mouse over the bios update link, and read read read!!!