I run a vista system and I have been pulling my hair out for months over this drive issue and spent ages trying to work out why my CD/DVD drives wont recognise discs with data on them. It was so simple just to make that slight adjustment to the registry 0 to 1 and it really has solved the whole problem for me. So don't go making elaborate changes, firmware installations or taking the drastic step of buying new drives just follow the earlier very very good advise and tweak the registry.