My dvd drive is not working

my dvd player has stopped working on my acer aspire 6920 laptop. I cannot figure out why it spins ok but does not show on screen or play. can anyone help. I am not an advanced computer user. please keep it simple .Thank you

Print this article, then follow directions to do a Windows system restore.
http://pcsupport.about.com/od/fixt [...] -vista.htm

Remove the UpperFilters and LowerFilters values with Registry Editor.

Click the "Start" button. Omitting the quotation marks, type "regedit" in the box labeled "Start Search" at the bottom of the "Start" menu. Press "Enter" to open the registry editor. The registry editor window consists of two halves. In the left half of the window, the registry editor displays the list of folders that the registry entries are organized in. In the right half, the registry editor displays the list of registry entries in the currently selected folder.
- Click the plus (+) sign next to each of the following keys:
HKEY_LOCAL_MACHINE
SYSTEM
CurrentControlSet
Control
Class
NOTE: When you click on the plus sign more folders will expand
out below it follow the expand set each time to find the next
folder listed.
- Click {4D36E965-E325-11CE-BFC1-08002BE10318}.
- On the right hand side of the window, click UpperFilters.
- Click Edit on the menu bar.
- Click Delete.
- Click OK.

- On the right hand side of the window, click LowerFilters.
- Click Edit on the menu bar.
- Click Delete.
- Click OK.
- Click Registry.
- Click Exit.
- Restart the computer normally.