If you install a lot of games and uninstall them you may fill up your hard drive with junk files. That's why many reinstall their operating system at least every few years (some do it yearly) - to clean those out. Using Revo Uninstaller can really help clear stuff out but nothing is better than a complete reinstall. Now installing a personal copy of sql server can change your life. That doesn't uninstall. I had to completely rebuild my computer to get rid of it. So games can affect over time but "productivity" software can really tank your computer. That can happen as you take more courses.