Vista - Problem with ATI MOBILITY RADEON X300 (code 43)

I real need help, i dont know if any of you still have problem with ATI or
not but i still have the same problem. and i real dont know how to fix it
please help.my ati drive is not working at all, i have install the vista beta
drive from ati.com but nothing happens. please let me know how to fix it or
from where i can get the drive.
thank you
I use ATI MOBILITY RADEON X300
this is the messenge i get.
Windows has stopped this device because it has reported problems. (Code 43)

i use this system:
Fjuitsu Siemens Amilo m 1451G
processor: Intel(R) pentium(R) M processor 1.70GHz
ram( 1023)
system 32-bit
Vista RC 1