Both of my dvdrw burners dont work

[qanda]This thread is about the Samsung TS-H552U. Click here to see full specs[/qanda]Well i have a SAMSUNG TS-H652 dvdrw and a
LITE-ON IT CORP MODEL SHW160H6S lightscribe dvdrw

I recently bought a couple computers for cheap and built one from the parts. i got windows xp on one harddrive and uploaded my vista onto my other harddrive. In vista both drives can get the driver but it doesnt ever read any dvds or cds at first it did, but i did updates etc,at first the dvdrw worked. i dont have any high or low filters to delete. Does anyone know what the problem might be? Thanks in advance