LG BD-RE drive doesn’t read DVDs

I’m having issues getting my computer to be able to read DVDs. I have an LG GBW-H20L blu-ray SATA drive which seems to read CDs just fine, but I cannot get it to read DVDs (I’m unsure about its blu-ray capabilities as I currently do not have any blu-ray disks). I am currently running Windows 7 Ultimate RC on a custom built computer.