I have all the codecs and I can play the movies with any player but can't with RoadRuner. I have audio but the scree is black
Can you play it normally with Media Player Classic ? it may be some video rendering option there.. try running Media Player Classic (mplayerc.exe) manually (out of RR) and see if the movie plays.. if so, there might be something wrong with RR in your machine...
Interesting.. have you tried to press the "Vis" or "ZOOM" button on the video player ? I have had issues with video not showing only when there were other windows on top of it.. please make sure to download the MPC.INI file with the binary package and try and delete the mplayerc.ini file in media player's path.
If you have a mouse handy, try right-clicking in the Black screen to see if the menu comes up.. if not, MPC is behind the backpanel for some reason.