First of all:
Which distro are you currently using?
One of the most important questions ;)
As for the winX, I think you're referring to
X-Windows ... easily fixed. Open a console,
become root (su -) and type init 3
Then try the sh NVIDIA... again.
TOSIBA DVD-ROM SD-C2612
Looks like its reconised, it reads music CDs fine, an can read my game CDs.
how ever, i try to play a dvd in mplayer, an it says
Could not open DVD dev/dvd not located.
Have a look at /etc/fstab ... which of the devices there
is your DVD?
If it points to /dev/cdrom
just make a symlink
ln -s /dev/cdrom /dev/dvd