DFI G5C100-NR - Manual (Page 86)

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BIOS Setup
USB Mouse Support
Due to the limited space of the BIOS ROM, the support for legacy
USB mouse (in DOS mode) is by default set to Disabled. With
more BIOS ROM space available, it will be able to support more
advanced features as well as provide compatibility to a wide variety
of peripheral devices.
If a PS/2 mouse is not available and you need to use a USB mouse
to install Windows (installation is performed in DOS mode) or run
any program under DOS, set this field to Enabled.
AC97 Audio
Auto Select this option when using the onboard audio
codec.
Disabled Select this option when using a PCI sound card.
Onboard LAN 2 Control
Auto The system automatically detects the onboard LAN
2.
Disabled Disables the onboard LAN 2.
Onboard LAN 1 Control
Auto The system automatically detects the onboard LAN
1.
Disabled Disables the onboard LAN 1.