USB not working or detected in Safe Mode or MS-DOS
Normally, you cannot use USB devices when working in a real mode environment (MS-DOS) or Safe Mode (in earlier versions of Windows). To do so, you must first install USB legacy emulation drivers, and Legacy USB support must be enabled in CMOS.
Some computer and motherboard manufacturers may have Legacy USB support or USB Keyboard Support in CMOS setup disabled. If this option is present, verify it is Enabled if you want to enable Legacy USB support.
If you cannot locate this option in CMOS, and you cannot located USB drivers for your device, contact the computer's hardware manufacturer.