Before, you could reboot, a message comes up as "Windows was not able to enable this device". A dvd in question is working fine as you have used your old drive to boot your computer and fully able to have full use of that drive. You can go to Windows XP device manager to make sure there are no problems with your DVD device driver.
Go to "Start" then select "Control Panel. In control panel select "System" then click on a "Hardware" tab. In hardware click on "Device Manager" button. In Device Manager select your DVD player.
If there is a yellow exclamation point then uninstall and reinstall that device. Click an uninstall icon at top of device manager. Then with "Scan for hardware changes" icon, reinstall it. If there is a red X then right click and select "Enable Device".