no sound card device

Windows Media Player cannot play the file because there is a problem with your sound device. There might not be a sound device installed on your computer, it might be in use by another program, or it might not be functioning properly. this is the message that pops up when i try to play music on my computer i may have accidentaly uninstalled the sound card and cant find where to install a new one they type of computer i have is a compaq predario someone please HELP ME

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