m/b is ASUS x79 - $360 I think, OS is win7 pro. The weird things is that USB keyboard/mouse is supported by BIOS but not win7 w/o ASUS driver. There is only one ps/2 hook so user can only hook either ps/2 key board or mouse but not both, neither is hot plug. It is painful then to install driver as ASUS driver disc uses GUI not support tab/cursor keys. ASUS - A StUpid System!