To access the BIOs setup power up your system and press F2 at the Dell BIOs.

In the BIOS setup there should be a category called onboard devices, expand it. Within this category you will be able to enable or disable the card reader.

Note: The mouse/touchpad isn't present in the BIOs setup, you will have to use the keyboard arrow keys to move between the fields and enter to select a setting.

When finished, press esc and you will be prompted to save and exit or just exit. Select save and exit.