First of all I have to tell you that the problem with your cd/dvd rom is not due to the device driver. The most common cause for these kind of problems is the cd/dvd rom's laser itself. Also the link that you mentioned is for FIRMWARE UPDATE (
only for use with the products identified and sold in United States, Latin America, or Canada. Not all models are sold in all countries) and not drivers update for your device. As far as the free space on your cd rom, since it's a recording media you will always see the free space as 0 with the windows explorer. Take a look at this print screen from my laptop's cd/dvd rom:
Try to remove your cd/dvd device drivers, as you did before, reboot your system and let it install by it's own the drivers that it will ask for; don't force it to use drivers from a specific place. The generic cd/dvd rom drivers are already included in the windows XP. In case that after that the cd/dvd is not working properly, eject the tray and use a Q-tip with isopropyl alcohol to clean up the cd lens manually (you will locate a small glass lens near the center of the tray). Leave the cd tray to dry and try again. If this doesn't help, sorry but you have to check the cd/dvd rom harware for errors at a proper computer store.
In case of a problem or clarification, don't hesitate to post me a reply.
If you are satisfied, accept my solution.
Thanks and regards
Stelios
direct FixYa link: http://www.fixya.com/users/technical114