Big problems after installing ATi drivers

Hello,

I used to have openSUSE 11.1. When I last week installed the ATi drivers, as they show on the site, and I rebooted after insatllation, in the splash screen he loads 1/2 and then I don’t see anything anymore. I have ntested the failsafe to, but there I had after 1/2 minute, again nothing to see! Black screen.
What can I do?

P.S.:My English is not so good, 'cause I am 13 jear old;)! So don’t make it too hard for me!

I forgot to tell:
I have got a triple boot:
Ubuntu
openSUSE
Vista (Sorry, school)