Well the problem's fairly simple, my optical drive won't read DVDs on W7. CDs work fine (I tried Diablo 2 & Warcraft 3) but DVDs won't work. I tried one I burned myself, several games and a few dual-layer ones. Windows just doesn't see a disc in the drive and when I want to open the disc from my computer it simply ejects the DVD tray and asks to insert a disc. I have a Optiarc DVD RW AD-7173A ATA. The discs themselves are fine as they work on my laptop (tried Vista & Ubuntu), CDs work fine as well and the drive worked on XP. (Can't try it now as W7 is the only OS on my main computer now.) EDIT: Tried some more DVDs and for some weird reason my W7 install disc actually works. That one is the only one though. It won't read any other DVD I put in.