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allow 3rd party drivers

 from

http://www.w7forums.com/dvd-drive-not-working-after-installing-windows-7-a-t9194.html

To fix the problem that dvd drives are not recognized in Windows 7 permanently do the following:
Option 1:

1. Press Windows R, type regedit and press enter.
2. Open the Registry key
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
3. In the right pane, right-click UpperFilters, and then click Delete.
4. Click Yes to confirm the removal of the UpperFilters registry entry.
5. In the right pane, right-click LowerFilters, and then click Delete.
6. Click Yes to confirm the removal of the LowerFilters registry entry.
7. Exit Registry Editor, and then restart the computer.
Note After you remove the UpperFilters registry entry and the LowerFilters registry entry, you may lose functionality in certain programs such as CD recording programs. In this scenario, you must reinstall any affected programs. If the problem recurs, contact the program vendor to determine whether an update is available for the program.

Option 2:
Click on Start -> All Programs -> Accessories -> Right click Command Prompt -> Run as administrator.
Paste the following line and hit enter afterwards
bcdedit /set loadoptions DDISABLE_INTEGRITY_CHECKS
This should solve the problem of DVD drives not being recognized in Windows 7.

Also try this fix if you’re still having issues:

Temporary Windows 7 DVD Drive Not Working or Recognized Fix – Solution 1

Restart your Windows 7 machine and as the computer starts press F8. The startup screen should look like this:

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