ATI Radeon 9550 Display Driver ?

I recently installed an ATI Radeon 9550 HD display driver to my computer, Windows XP SP2 32bit . Before that, my computer was running in VGA mode only. But though, I have downloaded the driver and installed it with the Catalyst Control Center. After rebooting, what I got is a black screen after Windows XP boot screen. I shut down the computer and now I saw the classic WELCOME with the blue background... but nothing more. After rebooting the PC for about 5 times, I got past the WELCOME stuff and to the desktop. As I watched the Device Manager, It says the I Have Installed the ATI Driver and its secondary Driver. But though, if I right-click my desktop and go to Display Properties>Settings>Advanced>Display Adapter I saw that there was no Display Driver and I was still running in VGA. VGA sucks because you can't play any 3D games or even Google Earth won't work. Now everyday I start the PC, I have to reboot about 5 times untill I get it working. It's been almost a month since I'm doing this and it caused me alot of nerves and boredoom.But though, sometimes I think the ATI works since I boot the PC, then I see the black screen and hear that start sound like when you XP starts. I managed to acces the Narator and saw that PC was actually working, except was like blind. I am looking for some fix tips and reply ASAP.