Did you install ArcSoft CD/DVD LabelMaker since the last time that your CD/DVD drive(s) were recognized. I ran into this problem and thought it had something to do with ImgBurn because I was burning an ISO image right before I installed the ArcSoft software. Come to find out from Technical Support for my computer that the CD/DVD drives no longer had the ability to load the driver because the ArcSoft software installation had added an entry to the registry. This ArcSoft program is supposed to work on Windows Vista and it does, but it caused the CD/DVD drives to be missing from the ImgBurn software and also from My Computer because the CD/DVD drivers fail to load.
If you did recently install ArcSoft CD/DVD LabelMaker, look at the registry key Hot_Key_Local_Machine\System\Current Control Set\Control\Class and go down through the class entries until you find the one for the DVD/CD-rom drives and look for an entry there that includes either the words 'low' or high'. There is another word in this entry, but I have already deleted the entry and i can't remember what the full wording was. When you find this 'low' or 'high' entry, right-click it and delete it. Then reboot your computer and your drives will show up again. My DVD-CD-rom registry entry was HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}, but your Class entry will probably be different. This was the very first 4D entry of about 5 or 6 that started with 4D.
Having said all that, if you have not recently installed ArcSoft CD/DVD LabelMaker right before your ImgBurn software stopped detecting writers, then I don't know what the problem could be. I hope that this helps if that is why you are having this problem.
Hey, I actually just uninstalled the arcsoft label maker since the last time I used imgburn.......
