Approximately 2 weeks ago, every once and a while after I boot up my notebook, I would hear a 2-3sec audio clip from my speakers - sometimes a sound effect, other times a voice. lol. No applications would be loaded when I hear this sound. It only happens after I boot up - maybe a minute? Nothing appears, nothing seems to be running in the background out of the ordinary from msconfig. I have 2 gigs of ram, 700mb of which are being utilized immediately after bootup. I read similar threads, but most individuals said it sounds affects often present after you update software. I have not updated in a while. I ran AVG and it's clear of any viruses. I am also up to date with Vista. I notice a popup from windows informing me that a file 'ndt2.sys' is not responding properly. I researched that and found it 'could' be a trojan. Sounds bizarre, I know. Ideas?