Check for updates, when I first installed windows 7 there was 100+ updates and that took a while. Next find the latest drivers for your graphics card. You can do this just by typing in your model and then drivers on google, I usually check every few weeks for more driver updates. If you want to overclock your GPU some download MSI Afterburner; if you want to overclock your CPU do it in the bios. If you do overclock I would get the CPUid Hardware Monitor to make sure your getting good temps. Besides that just install Steam and start gaming.