Vista - blank screen after installed driver

Hello!

I have a problem with my graphic crad driver..

yesterday I installed Windows Vista 64-bit on my computer,
After I insert to windows, I installed the all driver..
I done to installed the all drivers.. now I need to install other driver for my graphic card, after it's done to install them, It's doing reset for system,
after that, when the windows is uploading.. when the "Welcome" screen,
my screen shutdown! blank screen! but I hear the sounds of the windows!
I goes to Safe Mode, and there i removed the driver,
Now I work with standard VGA graphics adapter..

I tryed to downloads another drivers from the sites: Leadtek, Nvidia, and Omega drivers..

I don't know what is the problem

My graphic card is:
LEADTEK PCI-EX 2.0 WINFAST GeForce PX9800GTX+

Pls, help =/
and sorry with my English..