Sound Problem

Ok, so I have myself a problem that I hope you can help me with (better than shelling out money, eh?)

So the other day I was recoding something (myself playing guitar, if you must know, nothing too loud) and I notice a weird noise. I chalk it up to my crappy $5 mic and close window's default sound recorder and press play on ITunes only to find the same sound coming out of my left speaker. I was pretty bummed, thinking I had blown my speaker. I realized there was probably nothing I could do but to wait and get the speaker replaced. Later on I put my IPod headphones in to listen to something only to find the same sound coming out of my left headphone. I figured I have a problem with my sound card, so I figured I'd see if anybody can help me out so that I perhaps might not need to shell out for a new card.

Here's a link to a recording I made of the sound, if that helps any.

I have my computer and speaker specs, too (in my...profile? I don't really know how this site works)