Ok, I have played DVD's on this computer before... because I upgraded my CD-ROM to a DVD/CD-R Combo. I had to reformat my computer and I lost my DVD playing software... but the DVD installed InterActual Player automatically and I got it to work once, but then there was another error and it had to shutdown. Now all it does is give me this error when I try to play DVD's Error PL4013: Playback failed due to a problem with the video subsystem. You may be using an unsupported display mode or your system may not have a working decoder installed. Please ensure that your DVD decoder is functioning properly by launching it from Start | Programs. Can anyone help me?