Easiest way should be to restore to a state before you downloaded the driver. If that fails click here and check out the options. If that fails whilst booting up hit F8 and select last known good config. If that fails and you have the XPCD than go to start and run and type sfc /scannow If that fails then perform a repair installation of XP.
1. Boot the computer using the XP CD Change the BIOS options if you have to.
2. When you see the "Welcome To Setup" screen, you will see the options below
This portion of the Setup program prepares Microsoft
Windows XP to run on your computer:
To setup Windows XP now, press ENTER.
To repair a Windows XP installation using Recovery Console, press R.
To quit Setup without installing Windows XP, press F3.
3. Press Enter to start the Windows Setup.
Do not choose "To repair a Windows XP installation using the Recovery Console, press R", (you do not want to load Recovery Console).
4. Accept the License Agreement and Windows will search for existing Windows installations.
5. Select the XP installation you want to repair from the list and press R to start the repair. If Repair is not one of the options, read this Warning!!
6. Setup will copy the necessary files to the hard drive and reboot. Do not press any key to boot from CD when the message appears. Setup will continue as if it were doing a clean install, but your applications and settings will remain intact.
Reapply all updates as they have been killed.