how do you find the UpperFilters" and "LowerFilters"
You need to run the Registry Editor (regedit.exe) to gain access to those items, but there are a couple of "fix" files available for this problem which will save you the hassle (and potential danger) of having to manually edit the Registry. Try this fix (it's for XP, but might work on Vista too):
Download
xp_cd_dvd_fix.zip.
* Right-click on the file and choose the "Extract all..." option; follow the Wizard's prompts to extract the enclosed xp_cd_dvd_fix.vbs file.
* Double-click on xp_cd_dvd_fix.vbs to run it. If you receive a confirmation or warning message asking if you really want to run the script, choose YES. When the script finishes running, you will get a message saying that it has done so, and that you should reboot.
* Reboot the computer, and then check Device Manager; your drives should be present again.
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