Originally posted under post "Matshita DVD-RAM UJ-850S ATA Device". Advised by Kimsland to move it to this thread. have an ACER 5100 with Vista home Premium. I have recently had problems with the above CD/DVD device. One day it is working perfectly, another day it does not appear in MY COMPUTER at all. When not working the computer seems to try to read the drive on startup as normal but then nothing happens. I have read many posts detailing problems with this device and have followed the steps to remove the Upper and Lower filters mentioned in numerous posts. This has not solved the problem. I have also followed the steps in the link : UPDATED 8-step Viruses/Spyware/Malware Preliminary Removal Instructions and have included the logs as requested. I have also followed by advice by Kimsland and removed bittorrent and AVG and installed Avira. Any further advice would be greatly appreciated. I am living in Southern Thailand and can not just go to the local computer repair shop so am praying for a solution. Thanks in advance. P.S. today my drive has reappeared again after missing for 2 days.