SiS has posted a new AGP driver v1.15. It supports the following chipsets: SiS540, SiS630, SiS630ET, SiS630E, SiS630S, SiS630ST, SiS635, SiS645, SiS645DX, SiS648, SiS650, SiS651, SiS730S, SiS730SE, SiS735, SiS740, SiS745. The file weighs in at ~5Mb and is valid for Windows 95 - XP.

http://download.sis.com/sisdlc/driver_list.jsp