Windows

hard drives dont read cd's
does the door close?
if not close it.

1)left clik my computer
2)double clik the cd rom drive, making sure theres a disk in it.
3)right clik on my computer
device manager
look for a yellow exclamation point or red X where the cd-rom is.
high light the cd-rom
right clik
uninstall
restart the computer
windows will detect and re-install the cd-rom drive.
try a cd

if that doesnt work update windows

also buy a cd-rom cleaner at your local electronics store
clean the drive w/th cleaner
try a cd

if updating your driver for the cd rom drive and all ive suggested then its time for a new cdrom drive