I also tried to install Windows 2000 (with stock generic ide driver) and it was fine, that's why i think there is something related to OS (don't know if the culprit is kernel, oudated dll's, device drivers - i used W98 stock ide driver - or what else). If i'm not wrong ASUS P5K is Intel based, so maybe my issues weren't related to the cpu architecture. Unfortunatly the mb is broken so actually i'm not able to do further testing.