Computer Audio issue- Singing from music sounds distant

[Jaysay3]

I'm not sure of the issue or what details are needed so i hope i cover everything. And not sure what category this should be placed under. But the sound coming out of my speakers is muffled. When listening to music from the desktop, the instrumental comes in perfectly fine, however, once the actual singing starts, the voice sounds like its coming from a mile away. I've went through the setting and cant seem to find anything that would effect only the voice. If i hook the speaker to my iphone, music comes in just fine, so its not the speakers themselves. Im not sure what would cause only the singing to sound distant and the instruments to sound perfectly fine.
Any ideas? Using Realtek HD Audio Manager if that helps. I believe i am using Windows XP, though im sure its an older version. This problem has only started about a month or 2 ago, it worked fine prior to that.

 

[DeViL5o5]

have you tried the audio port(?) at the front panel of your computer? is the audio cable plugged all the way in?