Windows 7: Microphone stopped working after Windows 7 Service Pack 1

Hi, I'm using a pair of Razer Megalodons and since I updated to the Windows 7 Service Pack 1, the microphone has not worked for me. Audio on the headphones works fine. It worked completely fine before the service pack update. The Megalodons do not not have any driver updates and I've even updated my realtek driver. I've checked the devices and confirmed that the microphone and headphones are both the default devices and are enabled. Is there anything I can do to fix this?