Yep, the instructions from Intel are pretty clear. What BIOS version did you install? Did you enter BIOS and then go into the ADVANCED menu?
1. Reboot (or power on) system.
2. Press "F2" during POST (Power-on Self Test) to enter system BIOS setup program.
3. Select "ADVANCED" menu using arrow (left and right) keys.
4. Select "USB Configuration" and press <enter>.
5. Enable "High-speed USB".
6. Press "F10" to Save & Exit BIOS setup program. ( Hi-Speed USB 2.0 controllers are now enabled and your operating system should detect New Hardware during the next normal boot cycle.
7. Cancel "New Hardware Found".
http://www.intel.com/support/motherboards/desktop/sb/CS-009024.htm
Also, what OS are you running/ According to Intel it has to be one of these:
Microsoft* Windows* XP (all editions)
Microsoft* Windows* 2000 (be sure to have latest Service Pack installed)
Microsoft Windows 98SE
Microsoft Windows Me