My cds wont show on my dvd rw

my dvd burner wont burn or show cds y is this it plays dvds but it wont even bother to look at a cd. this has been going on for about 6 months and its a Lite-On DVD-Rw LDW-451S i got it with my computer i have put it on it worked
then 6 months ago it stoped reading cds then 3 months ago stoped burning cds or dvds i only ca watch them

could some one tell me how to fix this.

contact me on mudgard2004@hotmail.com on msn or aim is mudgard2

thx.

It stopped because you either have installed tools like CloneCD/Alcohol or the lens of the drive needs to be cleaned.