Dark Mantis: There are no Legacy options as is in this BIOS.
There are "USB 1.0" and "USB 2.0", and then "Keyboard", "Mouse" and "Storage".
Disabling 2.0 makes the BIOS not recognize the USB stick. The same with Storage. Enabling 2.0 and Storage makes the BIOS crash as soon as the stick is inserted, even at the menu for selecting a device for booting.
Windows absolutely ignores the BIOS settings, the sticks always works once the OS is running.
F5BJR: It doesn't have a virus. Also, what kind of virus is able to auto execute when in BIOS, and then crashes it? It wouldn't get very far.