I have searched this problem for a day and finally found a resolution that was logical and worked.
I quote this answer from Carey Holzman:
"This arises if additional software has gone missing - usually that from a CD burning program that has been uninstalled, but let pointers to it in the registry. Get a registry patch file, cdgone.reg, from www.aumha.org/downloads/cdgone.zip
and merge it into the registry and reboot - you should then find the drives and will need to reinstall whatever CD burning package you wish to use. "