[ubuntu] Way to Re-install Sound Drivers? (Toshiba Satellite L745-S4210)

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http://ubuntuforums.org – I had installed Ubuntu 11.04 on my girlfriend's new laptop recently, it's a Toshiba Satellite L745-S4210 And at first things were perfect. Her Skype worked and the sound. But now, for some reason when she goes on Skype, her mic is not being recognized. So she can hear other people, but they cannot hear her when she talks. Also, the sound coming out of the speakers is now abnormally poor quality. I'm not sure what went wrong to mess up these settings. Is there any way to wipe out and then re-install the sound drivers, rather than reinstalling the entire OS again? (Hardware)