Reverend is correct

You need to force windows to detect and update your display adapter.

You can try to uninstall the display drivers and force and install of the standard display adapter.

Next you can go into safe mode and remove any multiple display drivers that may be in the system properties of device manager.

An old hewlett packard i had lying around had 12 video display drivers installed so it would be easier for the techs to place an upgrade in the model

You should also enter the bios and try to change the default IRQ or you can enable/disable pallet snop to really force xp to re-install the device.

It sounds like you have some kinda of conflict.