Audio problems, specifically earphones. - switching headphones from right to left

[Jack]

I'm not at a machine where I have access to look up what exactly you need to do, but if you go into the control panel and either into the sounds or multimedia (Can't remember which off the top of my head) and search around a bit you should find a setting to invert stereo.

Or you could just spend the 10 bucks and buy a new set of headphones.