I can hardly understand what Hassaan was saying... regardless of your decision to purchase a graphics card or a motherboard/CPU combo, you will not lose anything nor will you have to install your OS again. Like Aeronautics said, your GPU is most-likely what you need to upgrade if you're wanting to game. After doing some research on your current components, your CPU is solid enough to sustain you during MMO gaming. Your GPU is dated and would be what you'd want to replace. Next, you're going to need to decide what your budget is.