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 on msn or aim is mudgard2


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