Please go to this page and select the chipset of your motherboard.
The Intel 100 Series and 200 Series platforms bundle with XHCI USB controller and Windows 7 cannot recognize XHCI. The user must enable “Windows 7 support” in the BIOS so that the USB keyboard and mouse will work during Windows 7 installation.
This “Windows 7 support” is patch solution and the user must disable this item after entering Windows7. If this is not disabled, the USB devices will not work under OS.
Please revert back to the original BIOS to find out if it relates with the new BIOS or not. If the problem still exists after you revert back to the original BIOS, we recommend doing a CMOS clear to load a system default for better stability.