Try to start system in safe mode and see if you get the same event, if not it could be a bad video card driver. Also do your basic maintenance, disk check, scan with antivirus in regular mode and in safe mode, and run memtest86 to check for bad memory, Post back on what you find out!
i did find out what my problem was, i had installed amd ramdisk software and made the ram disk as my paging drive..when i reset paging drive to default, it was gone....i have my replaced video card installed in my system, and it is running smoothly.I haven't played GTA IV yet, afraid card might burn out like last time. Why did my card burn out?. is it because of mobo or the video card?