Im trying to install my ATI Radeon 9250 265mb graphics card and I have installed the Catalyst control center but when i turn off my computer and unplug my machine and put in the graphic card (PCI) And boot it back up i get nothing but a black screen. I didnt unistall my onboard graphics card drivers because i didnt want to mess anything up

To solve this problem, uninstall the old driver, the ATI Radeon, it will not cause a problem when you uninstall it. After the uninstall, restart the computer and then install the support cd for the NVIDIA Geforce 9500 GT.

To find the latest drivers for your ATI card, use this link I have provided
to find more info about driver updating and graphic card drivers.
make sure you download the right driver for your graphic card(graphic card name) and also download the right catalyst control center to take full advantage from your graphic card.
Good Luck.

i would suggest you to visit www.download.com
as you would find a generic driver for your graphic card

thanks and regards

Try installing the lastest catalyst drivers: http://ati.amd.com/support/driver.html

Go here:
ATI Catalyst 8.2 - ATI Radeon - XP

Then, near the bottom of the page, click on:
Individual driver download packages, ATI Multimedia Center, Avivo™, and Korean full package and download the Catalyst Control Centre package (download 2 of 3)

Here is a direct link, but i don't know if it will re-main active:
AMD GAME! Drivers and Utilities
Then click on "Catalyst Control Center (English)"

This package will only install the ATi CCC. I personally have found that the ATI CCC doesn't like older cards, but some people have had luck getting it to work. If it doesn't work, you'll either have to find an older Catalyst Control Center, such as the one bundled with the Catalyst 4.10, or go back to using an old version of ATi Catalyst Control Panel.

Radeon 9550 series.: http://game.amd.com/us-en/drivers_catalyst.aspx?p=xp/radeonx-xp
Download the Catalyst Software Suite Driver & CCC. You will find a ton of control within the Catalyst Control Center.
Remove any ATI software before installing the newer combo.
If you get a error during uninstall through the control panel run ATI's uninstaller at.:
http://searchna.ati.com/promosearch/?site=us-en&la=en&qt=cat-uninstaller&selectsite=ATI&sp_a=sp10039240&sp_p=all&sp-x-1=col&sp_f=ISO-8859-1&sp_q=cat-uninstaller&Search.x=9&Search.y=8

ATI does not like drivers installed over top of it's self. Weird I know. So uninstall through your control panel. If the uninstall fails download and run.:
http://searchna.ati.com/promosearch/?site=us-en&la=en&qt=cat-uninstaller&selectsite=ATI&sp_a=sp10039240&sp_p=all&sp-x-1=col&sp_f=ISO-8859-1&sp_q=cat-uninstaller&Search.x=9&Search.y=8
After a reboot install the new driver & Catalyst control center.

You need ATIs Catalyst Software to run dual monitors. Just installing the drivers is not enough. There is a bummer part of all this. Before you install the latest driver/Catalyst Crontrol Center, you will have to uninstall your current X800 software through Control Panel. If it fail to uninstall you will need to use ATIs uninstall software called: cat-uninstaller.exe. The first link below.
When you have the new CCC & driver installed you'll need to setup your dual monitors within the Catalyst Control Center. K
Uninstaller: http://searchna.ati.com/promosearch/?site=us-en&la=en&qt=cat-uninstaller&selectsite=ATI&sp_a=sp10039240&sp_p=all&sp-x-1=col&sp_f=ISO-8859-1&sp_q=cat-uninstaller&Search.x=9&Search.y=8
Radeon X800 Driver/CCC software: http://game.amd.com/us-en/drivers_catalyst.aspx?p=xp/radeonx-xp
1 last item. Please make sure your operating system is updated. ATI wants you to have .Net framework 2.0 installed before you install the driver package.

http://www.opendrivers.com/driver/240370/ati-radeon-graphics-card-driver-catalyst-7.11-windows-vista-x32-english-free-download.html

ATI can get confusing. You might have installed ATI's CCC, "Catalyst Control Center", along with the display drivers. I suggest you download the latest combo-CCC and drivers for your video card. ATI comes out with new drivers pretty fast. When using dual monitors CCC is where you want to setup your monitors. After you set up the catalyst control center you'll find it much easyer to assign what monitor displays what. One other suggestion. ATI will want you to uninstall any other software for your ATI card even though all you have is ATI software.
Driver site: http://ati.amd.com/support/driver.html
ATI's uninstaller utility: http://support.ati.com/ics/support/default.asp?deptID=894&task=knowledge&questionID=1447