My DVD/CD ROM cannot read or play any type of disc.

I bought a new computer and after 2 weeks it happened. I don't know what's
the cause . I gussed maybe I had used a dirty CD or an infected one, first I
used CD cleaner but it couldn't read that also.Then Norton Antivirus2003
showed some infected files and delete them and now there is no virus in my
computer. Finally I followed all steps of windows troubleshooting , but it
can't read anything yet. Device status in WinXP shows that it works
properly, I can eject it by Windows and when I insert a disk it begins to
rotate and the green LED infront of the device flikers but after some
seconds it stops and windows shows this message: " Please insert a disk
into drive G: ".

Event Viewer shows this events since I bought my computer till CDROM didn't
work:
1)
Type :warning Source :cdrom Event :51
Description: An error was detected on device \Device\Cdrom0 during a
paging operation.
2)
Type :error Source :atapi Event :9
Description: The device, \Device\Ide\Ideport1, didn't respond witin the
timeout priod.