The dvd/cd driver on my hp pavilion dv4 suddenly decided to stop reading the ovie files. i still can listen to music or play games from cds. but it's not opening any kind of movie files. when i put a cd with couple of movies in it ( i cannot remember the extension types unfortunately) it tells me to insert disc.

HI,
This is gonna be a bit complicated since were going to access your registry, but just follow all the steps and it will be much easier
>Click on START
>Type REGEDIT on the search bar on START Menu
>Expand HKEY_LOCAL_MACHINE
>Expand SYSTEM
>Expand CurrentControlSet
>Expand Control
>Expand Class
>Click {4D36E965-E325-11CE-BFC1-08002BE10318}
>Look for the Upper Filters / right click on it / click on Delete
>Look for the Lower Filters / right click on it / click on Delete
>Restart PC
>Try you CD / DVD ROM
If nothing happens, click on this link then click on RUN and follow the steps, then restart computer and try to run a disc again, if still nothing happens, theres a possibility that the problem is with the hardware side or the media player that you are you using...

Hope this will help...Your response is very much appreciated...