There are free downloads of driver detection software available that will scan your pc's applications and drivers. They will notify you as to whether or not you need to update a driver, and generally direct you right to a source online where you can obtain it for free. Drivers need to be updated quite often, and with most applications, we are rarely notified.
Finally, there was an issue a year or two ago with Logitech webcams and the Vista operating system. Apparently Vista users would install their Logitech webcams and inadvertently knock out their audio drivers altogether--so it could be something really weird and seemingly non-related.
Below is a link for "Driver Magician" on Cnet (a pretty reputable download site, IMHO).
http://download.cnet.com/Driver-Magician/3000-2242_4-10224337.html
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