whenever i've used condenser mics, like with the blue snowball, it records in mono. By default, playing mono audio in stereo plays it in the left ear, at least as far as i've experienced.
hit windows key. Type "sound"
go through your playback devices, right clicking each option and selecting "test" until you hear it from your speakers. Then, with that device selected, click "set default device"
As copied from the "How to Ask for Troubleshooting" guide:
When was the last time the computer worked right?
Was there something that happened right before things got bad?
Did you install some hardware?
Did you install some software?
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Are you able to access the BIOS?
Have you tried...