I have an Auzentech X-FI Prelude card, that's suddenly stopped working for my microphone. Whilst my microphone's in the mic input it's practically inaudible though loud noises are picked up, and it doesn't seem to work at all on the line-in input. Mic boost etc. is on, and the drivers are up to date. It just seemed to stop working one time I switched it on, and I've tried reinstalling the drivers. I'm on Windows 7 64-bit. Any ideas how to fix this? The microphone definitely works.