I know this may not be of any help to you but I am having similar problems with my system.
Its only 4 months old and the OS is Windows XP Home.
The support people have diagnosed the hard drive as being faulty.
When I reinstalled Windows just after delivery I did not know that I had to install the Mother board drivers so I omitted them.
The support people said that would have caused problems with the CD-RW.
One of the problems is that I have to eject the disk from the My Computer Menu.
So maybe you have a problem with the driver but don’t take my word for it as I am
fairly new to the game
Best of luck