From the images you provided I see you have a PC with an older AMI BIOS. More modern versions of BIOS and/or UEFI allow for much more fine-grained control about which USB connected devices can be disabled at starting the PC.
Mouses and keyboards that are connected through USB have no need to use for the latest incarnation of the USB protocol and still chug along with the lowest version of USB they can get away with (which usually means USB 1.1). That USB standard is more than adequate for those devices, mouses only send relative position data, clicks etc. Even a fast typist cannot type fast enough to saturate the data bandwidth provided by an USB 1.1 port.
The 'USB Legacy' option in your BIOS apparently means that USB 1.1 devices are disabled at boot.
Modern versions of BIOS/UEFI are able to distinct between USB devices and allow keyboard/mouse to be enabled while other USB devices are not.
Not sure if there is even a BIOS upgrade for your specific motherboard model available that gives you more fine-grained control over USB devices. Upgrading a BIOS isn't very difficult and doesn't take much time. However, if anything goes wrong during this BIOS upgrade procedure, there is a distinct possibility you brick your computer.
Some older PC's have some kind of backup BIOS chip on their motherboard, but most PC's only come with one of those chips and most are soldered directly on the motherboard.
Mess it up and you can look forward to time-consuming and (very) costly repairs. If you are lucky you can get a new BIOS chip from the manufacturer or you need to hunt for
a similar chip on a spare/(not too) broken motherboard (exact same make and model as the one you have). Replacing the old BIOS chip with the new one requires some expertise as well.
This is the option in the BIOS/UEFI from my 3 year old PC that would resolve your problem.PC WILL NOT BOOT TO WIN 7 PRO WITH USB PLUGGED IN
Unfortunately your BIOS doesn't seem to have it.