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CD & CD-RW Drives missing in My Computer - Dell Dimension 2400

I have a Dell Dimension 2400 running Windows XP.  Under My Computer there are no CD rom drives listed and I have two ( HL-DT-ST CD-RW GCE-8483B & Lite-On LTN486S 48 x max) - I got this info from the Device Manager.  This info shows with a yellow exclamation point in the device list - I tried uninstalling them - then rebooted.  The drives are detected and windows indicates new hardware installed - but they are still not listed.  I chatted with Dell support and they could not provide me withe the HL-DT-ST CD-RW GCE-8483B driver.  Any help you could provide to fix this issue would be appreciated.  Thank you.
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footech
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When I double click on the drive in Device Manager this is the error:
Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)
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I edited the registry and the drives are back; however, when I insert a CD in either drive I get an access denied message??  

Windows cannot access the specified device, path, or file.  You may not have the appropriate permissions to access the item.


Please help if possible.
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Also additional info which may shed light on this problem - an external DVD drive was plugged into a USB connection on this computer - all three drives are now showing up but if I put a cd in any of the drives it shows the name of the cd but I still get the access denied message
did you try my suggestion yet?
worth a try imo
Is there a Properties key under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318} ?  This key should have full permissions given to SYSTEM.  You won't be able to see any values inside it unless you also add permissions for your account.  At this point it may be helpful to uninstall the drives and reboot.

Does the problem remain if you create a new user profile and try from there?
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Sorry for the delay in responding - but I have not had a chance to follow up on the suggestions above.  I hope to do so in the next day or two.  
However, one additional question - I was reading the info on the link provided by web_tracker and just wanted to confirm that the info would apply to windows xp - most of the info on the link explains solutions for windows 7 or vista. Would the info apply to Windows XP as well?
I am sorry I assume you were using windows 7, some of the things will not apply for win xp.
did you try the drives one at the time yet? as i suggested?
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Thanks to all for your input.  What I finally tried (since all devices were listed in My Computer and appeared to be working properly after following the solutions you all provided) - I installed a free cd burning software instead of using the one that came with the computer (sonic) -- once I did that I was able to burn a CD and read from both CD drives.  Thanks again!
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