I have the same problem with a tx2510us. I installed the authentec driver
for the biometric fingerprint reader, but it keeps connecting/disconnecting from the device manager.
I couldn't get the fingerprint reader to work. So until then, I just disabled the biometric reader (in device manager). The sound stopped.
Changing the sound in windows sounds is not a solution because it will stop noticing you when you disconnect a usb drive or so. Instead, disable the biometric device.