Complete Driver disk as supplied from new.
Apparently covers Windows 95/98/2000/ME/XP/NT 4.0, but I have just used it for XP.
When installed, it identifies itself as "Samsung Mouse USB mouse". Driver version is 220.127.116.11 dated 10/09/2001.
Seems to fight with MS Intellimouse software, so best to uninstall Intellimouse first.