my video card

It sounds like a fairly straight forward hardware conflict, trying to load two set of graphics drivers.
Did you mean, you installed an AGP or PCI card and your system has an onboard graphics chipset?

If so, boot into safe mode, open control panel>system. Select the onboard graphics chipset (old card/chips) and choose disable in this hardware profile (I think that works in XP). If you uninstall it completely, it will probably just be rediscovered by Plug n Play as soon as you reboot and will continue to hang until disabled.
I would also uninstall and reinstall the new card AFTER disabling on board graphics.
Good luck
OM

0. Make sure that there is an XP driver for your video card. If this is an older video card, XP may not support it.

1. you need to stop XP from attempting to load the old video drivers.

2. You need to disable the on-board video.

Start by shutting down, and removing the new video card.

Boot up.

Right click on My Computer,
Select Properties.
Click on the Hardware tab,
Click on Device manager.

Expand the branches as needed, and select the video driver.
Click on remove.
This will remove the video driver so that XP will not attempt to install drivers for the on-board video.

Close device manager, and shut down the PC.

Check the system / motherboard manufactures documentation for how to disable the on-board video.

Install the PCI video card.

Either set the jumper, or enter BIOS setup and set the switch to disable the on-board video.

XP should now detect the new video card and install the driver.

Chas