Osprey: I ran the MS Fix it "wizard" for the upper and lower filter trick from your link above. When I use a DVD-RW disc to test, I have the following response: "Media in CD/DVD drive is not readable. The drive is empty or the media format is not supported." The same disc works fine in my laptop computer, and this disc has worked in this computer in the past.
If I test using a CD or a commercially recorded DVD, the wizard indicates the problem has been fixed. When I put the DVD-RW disc back in, however, it is still not recognized.