Northern Ireland is the smallest of the four countries of the United Kingdom in terms of both area and population, containing 2.9% of the total population and 5.7% of the total area of the United Kingdom.
If you are using a wireless mouse with a USB connector and a PS/2 keyboard, verify that the USB mouse is plugged in a USB port on the computer and that the purple keyboard PS/2 plug is connected to the purple PS/2 port on the computer.
The USB specification includes a specification for two particular Human Interface Devices (HIDs) - mouse and keyboard. All modern BIOSes and all current operating systems will work with these devices. So if a mouse is HID compliant, it will work with just about any computer running just about any OS out of the box without needing to load special drivers.