My problem is that my system does'nt show any dvd drive in lapto

Follow the below very carefully....it usually fixes these problems. If there are no upper filters, don't worry....just delete the lower filters or vice/versa...get rid of the filters....just follw the guide below. When you get to the registry entries below, the first one maybe the one you need to edit...just read the numbers carefully to make sure you get the right one....it is easier than you think...you can do it!!!

Windows Vista

1. Click Start

1. Click Accessories, and then click Run.
2. Type regedit, and then click OK.

1. In the navigation pane, locate and then click the following registry subkey:

2. In the right pane, click UpperFilters.
   
   Note 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.
3. On the Edit menu, click Delete.
4. When you are prompted to confirm the deletion, click Yes.
5. In the right pane, click LowerFilters.
6. On the Edit menu, click Delete.
7. When you are prompted to confirm the deletion, click Yes.
8. Exit Registry Editor.
9. Restart the computer.