You shouldn't need software to set up basic 2.1 speakers. They simply plug in the audio out at the back, probably then straight to the Sub and the sats run from there. Then you can change the way Windows views them through the Control Panel, click on Sound, Speech and Audio Devices then Sound and Audio Devices and you'll get a pop up box. On the Advenced tab on the speaker settings you can change the type of speaker you're using.
Some speakers do come with software, but it isn't normally a "Driver" a such just sound enhancements like graphic equalisers etc.
Hope this helps,