Eric12341

i have this weird problem, everytime i start up my computer i find that there is no audio driver installed, putting the computer into standby for 45 seconds is a temporary solution to this problem, after returning the audio driver reappears, only to disappear again the next day. this used to be an old problem that had occurred with the sigmatel audio driver back in 2006 when we first got this computer, but since june 2007 we upgraded to vista which did not use the sigmatel audio driver until i foolishly installed it again to try to find a way to listen to line in on my bluetooth headset, now after removing it im still having that problem with the microsoft high defininition audio driver. ive tried a BiOS update and the problem still persists. any ideas before i resort to doing a full re-install of vista