The Akai EIE Pro MIDI 2955 is an audio interface that provides MIDI and audio I/O (input/output) connections between your computer and external musical equipment, such as synthesizers, drum machines, or other MIDI-compatible devices. The Windows driver you're referring to is a software component that allows your Windows computer to communicate with the Akai EIE Pro and use it for audio and MIDI recording, playback, and other functionalities.

To ensure proper operation of the Akai EIE Pro MIDI 2955, you need to install the appropriate driver for your version of Windows. Without the correct driver, your computer may not recognize the device, or its functionality may be limited.