HP Pavillion dv2000 - Integrated mic problem

I have a 2 year old HP Pavillion dv2000 running Vista with an integrated webcam and microphone. They both worked worked perfectly until about a month ago, when the microphone started "clipping" in every recording program I would use it in. For instance, in Acid Pro, the mic input level will be maxed out, and after attempting to record, the playback is just really loud, obnoxious jumbled static. I have attempted to adjust the recording settings in Windows, but nothing works. I have the mic volume set at 50, which is what it was at back when it was working. I even returned all settings back to default. This may have started happening after a Windows Update, but I can't exactly pinpoint any instance of when it began. It says my drivers are current. I even uninstalled the device, and then reinstalled the drivers, but it's still doing the same thing. Any help or suggestions would be appreciated.