Repair CD/DVD Missing/Not Working:

This repair may help with CD or DVD drives that are not working as they should.

"The CD drive or the DVD drive does not work as expected on a computer that you upgraded to Windows Vista"
http://support.microsoft.com/kb/929461

"Your CD drive or DVD drive is missing or is not recognized by Windows or other programs"
http://support.microsoft.com/kb/982116 

