sound card is on the board, video card is Nvidia gforce 8500gt.so far done memory test, disabled video card, reinstalled video driver, upgraded video driver, moved memory to other slot, disabled few drivers in hardware profile one by one, uninstalled codecs installed divx codecs, so far nothing helps.
As my computer confections has been so slow last few days i haven't been in a position to do lot of research on net.
I noticed when i open any video player (used windows media player and divx player)
and then open any movie then i dont have this blue screen of death).
All movies are on the C disk and its only disk on this pc (wd 320gb).the C disk is not partitioned.
will do some work on it tomorrow.will keep you updated.