My PC was going extremely slow so my friend told me to use Disc Defragmentation and voila! My PC is like new, it works at least 5X faster than before and no longer freezes. What exactly does disc defragmentation do? I was wondering if I should also try "Disc Cleanup" option. Would that make the PC run even faster or should I not use it? He also told me to switch off the Auto Updates as that could be slowing my PC too.