If you’re using something like Windows 7 x64 Professional on a MacBook Pro, and you’re having audio problems, you’ll want to update your Boot Camp drivers.
- Sound only works 50% of the time, for any application (e.g. YouTube)
- Mic muted 100% of the time (e.g. Skype)
- Have to reinstall sound driver every couple of reboots
First update to Boot Camp 3.0. You’ll have to pirate it; Apple doesn’t even provide it as a download, though it officially comes with every Snow Leopard installation disc. You also have to update incrementally (v2.0 -> v3.0 -> v3.1 -> v3.2 -> v3.3), because the Apple installers don’t work that well.