Drivers - help 65

I have just upgraded to Windows 7 Pro from WinXP sp3. After upgrading, I cannot get either one of my CD/DVD units to work. They obviously woked when I upgraded caused I used a CD.

When I go to device manager it tells me that the drivers did not load because they either were corrupted or missing but when I try to upgrade the drivers it tells me the best drivers are already being utilized.

Help!! what do I do next?

Thanks for any help

Windows 7 DVD Drive Not Working or Missing:
1. Click Start, and then click All Programs.
2. Click Accessories, and then click Run.
3. Type regedit, and then click OK. If you are prompted for an administrator password or for a confirmation, type the password, or click Allow.
4. In the navigation pane, locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
5. In the right pane, click UpperFilters. You may also see an UpperFilters.bak registry entry. You do not have to remove that entry. Click UpperFilters only. If you do not see the UpperFilters registry entry, you still might have to remove the LowerFilters registry entry. To do this, go to step 8.
6. On the Edit menu, click Delete.
7. When you are prompted to confirm the deletion, click Yes.
8. In the right pane, click LowerFilters.
9. On the Edit menu, click Delete.
10. When you are prompted to confirm the deletion, click Yes.
11. Exit Registry Editor.
12. Restart the computer.