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To play any media on PC needs codec to support it. If you are playing video on Windows Media Player, go to Tools - Options - then in opened dialogue of options go to DVD - Advanced . Here (Properties dialogue) you will find the supported codecs for different media. If the video file you are playing is not mentioned then the video won't play. So download the required codec to support the video file. A better option is install PowerDVD software which plays almost every video file. Download the old version software from the following link.
http://www.oldversion.com/download-PowerDVD-7.html Name: Deluxe Serial Key of Power dvd 7: 7GP2X-RWAWT-QMEQA-6EZ9U-GE356-W3VQD
Also install real player.
go to control panel-sound-default audio device & check which device is enabled as default device. In case of HD audio remove the speaker jack & reinsert, if that port is selected as default audio then you should get an immediate message saying 'audio jack plugged in'.
open audio devices and sound properties in your device manager. Is your sound card listed? If so, highlite it and select properties...then see if it is enabled...if not, click enable this device. If not listed, try re-installing it with install new hardware. Finally, if its there, but wont enable, remove the device and reinstall it. If all the above fails, replace the sound card if its not intigrated. if it is intigrated, buy a PCI Plug and play sound card and install it in a pci slot.
i would suggest that you either roll back your driver for the graphics card or do a system restore to a date previous to when the drivers were updated, this wil show in the system restore dates boxes.
You are probably running the generic windows driver for your graphics, it's better to see what updates you are installing before updating any hardware drivers.