Copy the contents between the dashes and save as a .ahk file
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#NoTrayIcon
+^!Left::Send {Media_Prev}
^!Down::Send {Media_Play_Pause}
+^!Right::Send {Media_Next}
^!Left::Send {Volume_Down}
+^!Down::Send {Volume_Mute}
^!Right::Send {Volume_Up}
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http://superuser.com/questions/278951/my-keyboard-has-no-media-keys-can-i-control-media-without-them

Posted by przemoc, modified for pastebin by Keegan Jacobson (keeganjacobson)