i had the same thing happen to me before. sometimes your drives wont appear after u uninstall a burning app. this worked for me.
Start Registry Editor (Start, Run and type in regedit then click)
Find "UpperFilters" and "LowerFilters" (and "UpperFilters.bak" "LowerFilters.bak", if they exist) value under the following key in the registry, and delete it:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
Quit Registry Editor.
Reboot.
NOTE: You might need to reinstall any CD recording apps you have, if they start to not work completely, after doing this.
