I have a Microsoft LifeChat LX-3000. Driver Installed. But, computer won't recognized that it's plugged in. Went to "Manage Audio Devices", but it's not in the list. Driver says it's already installed when I try to reinstall. Headset is listed in the drives when I plug it in, but any program that needs to use it say it's not plugged in. What do I do?

If you go to Control Panel, System, Device Manager, you'll likely see the device listed in there. It either has a broken driver, or wrong driver. I would recommend you find a device that's not working properly or has missing driver (it would have a yellow mark in front of the name) and delete it. Then click at the top to refresh the list/search for new hardware, for it to install new driver. You may also try to open the properties of that incorrectly installed device and click on Reinstall, then point to driver that came with the headset. But given this is Microsoft product, it be capable of downloading the driver from Windows Update. The point is that's already installed but either with incorrect driver or no driver. That usually happens when you plug it in before installing driver. So you need to remove driver and reinstall it.

Another thing you can try if after installing doesn't work is use a different USB port. But that will use the same driver already installed for that device, so just doing this alone won't help in your case.

Hope it works for you.