While putting music on my computer one day, I noticed my computer was not recognizing my optical CD drive. I received the Code 39 error page. I looked it up and got instructions to fix this problem, by going to the registry editor to remove the Upperfilters and Lowerfilters. I removed these filters and it still did not work. Frustrated I took my computer to a local computer store and they said they fixed it. I got it back and they didn't fix anything. I looked in the registry editor expecting to find the Upperfilters and Lowerfilters were still there but they were not there. I have no idea what to do is there anything I can do?