Hi all, Problem. This all used to work, until about a week ago. My CD/DVD-ROM drive recognizes and reads already-written disks with no problem. However it no longer recognizes any disc as being writable using XP's bulit-in CD writing tool. Under Windows Explorer, with a blank, writable CD-R disk, Properties shows 0 bytes used, 0 bytes available. With a disk that already has data on it, it shows XXX bytes used, 0 bytes available. When I use the Windows CD-writing wizard, it tells me there is no disk in the drive. Re-inserting the writable CD, or another unused one, results in the same message. However, I used a third-party image-writing program to copy an .iso file, and that worked fine. It burned the image to the CD, and the CD is readable with the data on it. So the problem appears not to be hardware or the disks, of which I have previously used dozens from the same pack. I have tried the uninstall-device and reboot routine. I have used the "repair" option for the HiMat software, which apparently reinstalls it. I have made sure the XP CD-writing service is started. "Enable writing to this drive" is checked in the device's properties. I have replaced the four dll and sys files that are the drivers for the CD-ROM. Any other thoughts? -dan z-

This sometimes works :- Start, Run, type regedit and navigate to registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}. Highlight it and in the right pane, find the Upperfilters and Lowerfilters values. Highlight each one in turn, right click and delete them. Close regedit and restart the computer. If in doubt make a restore point first. Also, you really need to install SP2.

I've already done that registry modification also. Didn't help. RE: SP2 - tried installing it many times. I even bought the CD. After each "successful" install my system would no longer boot, so I finally gave up. Thank God for strict backup routines! Now if I could just get drag-and-drop to work to CD-R again, so I can back up small files periodically instead of the entire drive.... -dan z-

Have you looked at these 2 registry keys :- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer Look for subkey named NoCDBurning and set it to 0 to enable Windows burning.

The NoCDBurning keys did not exist at those locations, so I added them, dword, value 00. After a reboot, there was no change in symptoms. -dan z-

Have a look here http://support.microsoft.com/?kbid=...

I've already been to that page and tried everything that seemed remotely applicable.