Here are a couple of things to try:
- Go to Control Panel > All Control Panel Items > Autoplay and you will be able to change your preferences.
- Click the Windows Orb (Start), type regedit, press Enter and in the left pane navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Cdrom. In the right pane there will be a value called Autorun, double-click it and change the value to 1. To be safe, create a system restore point first.