Sound Recorder won't work on my new Acer T180 desktop.There is no response to my microphone. Under Recording Control (under Volume under Sounds and Audio Devices) MIC is grayed out. It is not grayed out on my old laptop, where microphone recordings have been working well for years on XP! Why is it grayed out? Is this a defect in the system? It seems clear MIC should not be grayed out? How do i ungray it?