Since I installed the audio driver that came with the motherboard online, I've had problems using the windows explorer. It becomes very slow and then the Blue Screen of Death "Kernal Inpage Data Error".
So I rolled back drivers for audio and video cards. I rolled back video because while updating the audio, I took the liberty to update video as well, being not sure of whether my video driver was automated by vista or manually installed by me long time ago.
Seems to be fine now. Backing up all my important files.