What is the reason for the computer behaving in this manner?
Your WinXP operating system became unstable after you installed a device driver and did not stabilize after you rebooted the computer with the Last Known Good Configuration.
A. The Last Known good configuration boot will only work for hardware changes and not software changes that have been made. B. The system restore application should have been used to save the system's registry prior to the installation of the device driver. C. The last known good configuration was unable to find a valid restore point because the system restores was not run prior to the installation of the device driver. D. The system registry is overwritten after every successful login and the settings on the initial install were thus overwritten after the first reboot and login.