system hang when i installed agp driver

i have P-3,128 MB RAM,6.4GB HDD,I INSTALLED WIN98 SE,WHEN I INSTALLED ATI 3D RAGE IIC AGP DRIVER MY SYSTEM HANG,(TI’S WORKING IN DISPLAY SETTING 16 CLOLOR).
NOTE:-SAME SYSTEM I INSTALLED 2ND HDD 8.4 OS IS WIN2000 PROF. MY SYSTEM WOKING FINE.