Lie rh71 said, try downloading Catalyst 4.11, since those are the latest. This is definitely not a video problem if your dad notices surfing the web. If you are running aggressive RAM timings at stock RAM voltages, back down the RAM timings or increase voltage to RAM by one increment. More importantly, check the BIOS for any device/IRQ conflicts. Then try running a registry cleaner. Test your computer's stability with prime95 and memtest86, to see the the problem truly springs from NFSU2 or is just there.