Disk drive (by 2 users)

A couple of days ago when i put in a cd to rip to my computer the sound from the cd being played was a bit slow like the disk drive wasn't fast enough to read the disk, but once i had ripped the songs from the cd they played perfectly because they were on the hard drive. I tried just playing a cd again without ripping it and i still had the same problem, the speakers would make a slight crackling sound and the sound would slow down and skip every one or two seconds. i then put a dvd in and the same problem occurred and this time with the picture. ( this is with windows media player and intervideo windvd.) My computer also has a separate dvd program which can be started without starting up windows and i put a dvd on there and it worked perfectly.