hi, thanks for reply. yes, it happened all of a sudden. 2 days ago until I shut down pc it was working fine and yesterday in the evening when I tried to call home, I found it wasnt working. actually, it says "currently unavailable" right now. I've tried updating my audio drivers (realtek audio) but it didin't help. windows updated yesterday in th morning. that's the only change in system. I will try to uninstall it and see, if it helps.