Run regedit.exe and complete the following details:

Key:[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CDRom]
Value Name: Autorun
Data Type: REG_DWORD
Data:(0=disable, 1=enable)


If "Autorun" exists, change value to 0.  Otherwise create a new DWORD value named "Autorun"

Reboot PC. 

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