Open Notepad ( Start | Programs | Accessories | Notepad
Copy and paste the following in Red:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Cdrom]
"AutoRun"=dword:0000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
"allocatecdroms"="0"
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
"NoDriveTypeAutoRun"=dword:00000091
Click File | Save As
Change Save as Type to All Files
give the file the name of autorunenable.reg
Save the file to a location you can remember
Now find that location, and double click the file, It will ask you if you want to merge the file, click Yes