Recently, my computer has been very slow in playing games. There's no virus, no trojan horse, nothing that would increase the memory usage of my computer. The physical memory is at 36% currently, but everything starts to lag when I play any game on my computer. My friend tells me that my only choices are to give my computer more memory or completely reformat my computer. So, What I'm asking is, is there a third option? Is there a way to make my computer fast again without spending a lot of money or completely wiping the hard drive?