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Could be caused by anything really, so I would go with a process of elimination.
It could still be a driver issue. The windows default sound drivers are just older Realtek drivers. Maybe try the latest ones from your motherboard manufacturer website, or Realteks.
When sound went bad on my laptop, no amount of changing drivers did anything. But when I clean installed a new OS, the problems went away. So there could be another mysterious software issue.
Doing what sa547 said would eliminate any problem with the on-board sound card and likely most software problems too.
Also you could try different outputs, just to make sure there isn't a problem with the speakers or their cables.
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