Error Code 41 on CD-ROMs

NONE of my cd-roms worked. Even my emulated ones (that I use for mounting ISO files -- which, by the way, Virtual Clone Drive rox!) I found the answer on this page.
To resolve this behavior, follow these steps: Start Registry Editor (Regedt32.exe). Locate the UpperFilters value under the following key in the registry: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Class\{4D36E965-E325-11CE-BFC1-08002BE10318} On the Edit menu, click Delete, and then click OK. Locate the LowerFilters value under the same key in the registry: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Class\{4D36E965-E325-11CE-BFC1-08002BE10318} On the Edit menu, click Delete, and then click OK.