SiS released the new driver 3.10 for their Xabre series VGA cards
According to the .INF files the driver should work with SiS315 based cards ,too
Driver version: 02/13/2003 - File size is ~15MB !! 6.14.01.3100 (W2K/XP) and 4.14.01.3100 (W98/ME)
Link#1 (sometimes slow)