i checked it but it refers to windows vista, i have windows 7 x64. Anyway i sent a support ticket to gigabyte and here is what they replied:
"Windows 7 is still developing and not released in the market yet, thus we can not guarantee the system can work properly with Windows 7 OS, and most of the chipset vendor havn't release suitable driver for this OS, so currently we do not have driver available for this OS. We suggest you to test with other version like Windows XP or Vista and see if the problem still remains. Sorry for the inconvenience."
So i'll have to wait for a bios update i think, hopefully they'll be looking into it since other users have reported the same error on their win7 installations...